You could try putting some catnip on it, but some kittens don't have that reaction to catnip that bigger cats do, in my experience anyway. Really the thing that works the best is to leave your kitten in a bedroom or bathroom or some room where it will be comfortable, preferably with a window and maybe a comfy bed, or better yet, a cat tree, and leave kitty in there when it cannot be supervised. Then, only allow the kitten out when you can follow it around and the minute it goes for your couch, give her a loud, sharp NO, with a clap of your hands. You may also need to use the water bottle at first to spray them along with this. They learn to detest the water bottle pretty quickly. And if you stick with NO, and that one simple word, they can learn NO pretty quickly, but you have to actually catch them in the act. You can't go up to her after she has already clawed the couch and do this, it has to be right as they start doing it, that is the key. I do not believe that kittens, or puppies that young should have free run of the house, because there are too many things to get into, and too many bad habits to start that are later harder to get them to stop doing. I am a firm believer in them only being out when you are there to watch them. Same thing at night. Kittens are going to want to wake up and have playtime at 3-4 in the morning. But if you confine them to their own area at night, they can learn that nighttime is for sleeping, which is against their nature, as nocturnal animals, but they can learn it. Also, a big dinner right before bedtime will help them sleep better. When my babies were really little, they got their biggest meals right before bedtime, and then up in their rooms. Yes, they are still going to wake up at an ungodly hour and want to play and raise a ruckus, but they can very easily learn the routine. I have two boy cats that are put up in their room at 9:30, mostly because I have an older female that can't be out when they are, and she has free run of the house all night, so the boys sleep in their room all night, and they have learned that nighttime means sleep time. Cat's really like when they have an established routine too, so if you make it a nighttime routine, like it is in my house, they learn to expect it and eventually they don' t protest to it, it's just part of the routine. My youngest one, Stephano, he still makes a fuss for about 5 minutes when we put him up in his room at night, but then he gives up when we ignore his cries, and he does cry like he is being murdered for a good five minutes, lol.
I just think the best way to stop unwanted behavior, like clawing the furniture, is to keep them up when you can't be there to watch them. And usually, you will see that cats do this clawing thing at the same time. For instance, my Stephano, as soon as I let him out of his room at 5:30 am, he has a rug that he is allowed to scratch on (it's old and doesn't show so I let him), but he goes right to the rug to "get his scratch on", as I call it, lol. Now, he used to go for my couch and he got the NO, and the water, and the loud clap, and it only took a few times and he knew the couch was off limits. YOu have to kind of know when to expect it, that really helps if you can anticipate when they are going to do it. Another one of my cats, he "gets his scratch on" right after he eats his breakfast, he does the scratch, then goes to the litter box, every single day. Most cats eventually establish some kind of routine. I have a giant cat tree that he loves to scratch on, and we have been lucky enough that it is what he prefers to scratch.
Now, every now and then, my two boys will be playing and tearing through the house like two tornadoes, and they will zoom across the couch and you will hear their claws as they leap and bound over it, but I don't count that as scratching it, it's just them being cats, and that does happen. It drives my husband crazy and he will yell at them a loud HEY!, which means absolutely nothing to them, because they know NO not hey....and they are just playing anyway, so they don't even know what they are doing. So I just accept those little incidents where claws meet the couch as that is the breaks of having a cat. Every now and then, STephano will get some wild hair up his hiney and try to scratch the couch and my house is not that big, so I can catch him in the act and give the loud NO and he runs. He knows he isn't supposed to do it, and it is a rare thing when he does it. He has two cat trees that he prefers to scratch.
It's also a good idea to contain the young kitten to a room at this age because you want to establish good litter box habits. When they are this young, and they have the whole house or apartment to explore, they may find some alternate place to go to the bathroom. But when they are in a smaller area, and the litter box is right there, they will usually use it. You don't want to leave any clothes or blankets on the floor right now, nothing that could look like a good place to go, try to leave as little on the floor as possible. Once they are a little older, and they have established these good habits, then it is safe to let them start staying out longer.
I am no cat expert, just a cat nut, lol. But this is the way I do things, and it works for me. I just think little kitties are like toddlers, if you leave them too much to get into, they will do just that, get into everything and into trouble. They are so curious. They can still get into trouble in their rooms, and you should make sure you have "baby proofed" whatever room they are in too.
Ahh, they joys of having an 11 week old kitten! It's like having a crazy 2 year old, but one that can do ninja tricks, running around your house causing all kinds of trouble