Welcome to CF! Sadie sounds like a cutie-pie. Your Sadie-kitty just has a very strong instinctual urge to dig and bury her waste. Most of my cats will dig a shallow divot, do their business, turn around and lightly cover and then shoot out of the litterchest like their tail was on fire!
My husband calls it "running the stink off
Some of my cats will dig, and dig and dig...and when they are finished with their business they will bury and bury and bury. It is like they are excavators, because they will move the litter around into a tall 'hill' and leave a huge bare spot, just like your Sadie.
We do not have much of a problem with kicked-out sand (we use clay clumping litter, but I call it 'sand'
) because the litterchest is huge. My husband built it 2'x2'x4' with a lid and cat flap in the center front. It looks like a hope-chest, so it doesn't *look* like a litterbox, just another piece of *furniture*. Sometimes I get sand kicked out near the door, but never much. I also keep the litterchest at least 3" deep in sand so there is plenty of material for our (eight
) cats to bury their waste. I also keep one "jumbo" hooded litterbox in the bedroom for any kitties who sleep with us at night with the door closed. I prefer litterboxes to be big. Huge! The bigger the better. I feel cats need room to go in, search around for a good spot, excavate, room-to-go, room to turn around to bury AND big/deep enough that they don't uncover other buried treasure and step in that with their feet.
*even with such a big litterchest, I still scoop waste daily because the little urine clumps will begin to brerak down and smell strongly of ammonia if left in there. I had a kid come care for our cats while we were away and the boxes smelled AWFUL because he did not get all of the clumps out, every day, and the left-behind pee-clumps smelled of ammonia. I was very lucky none of our cats decided to pee somewhere else.
I would buy your girl a larger/deeper/hooded litterbox. Give her a big area and lots of sand to dig through to satisfy that instinctual urge to bury her waste!
If she is *too* vigorous in her diggings...several members have created their own 'litterchests' by using large Rubbermaid totes from WalMart of any of the Home Improvement stores. Things to keep in mind with one of those:
...if it is too small and/or doesn't have enough sand in it, a large or playful cat (one who like to "lanuch" from the edge
) will tip one over.
...choose a container that has a smooth inside, with few/no ripples or plastic support ribs that stick up and could cause difficulty when scooping solid waste out.
...some members leave the lid off and make the cat jump in/out, though I think litter gets scattered a bit further with that method.
...some like to leave the lid on, but have cut a hole in the top for the cat to jump down and then jump out of...but I also don't care for that because of the possibility of the cat jumping down and landing *in* buried treasure that is now mashed into their feet.
...you could make a 'cat-flap' in the side of the plastic tub/tote by cutting out a cat-sized rectangle (the opening in ours is a little bigger than 6"x8"
) with the bottom of the opening at least 2" above the level of the litter inside, then cutting off about a 1/4 to 1/2 inch all the way around the cut-out rectangle. Punch two holes in the top of the rectangle, then punch two corresponding holes in the tote over the hole and use key rings to thread the pieces together to swing freely or use small zip-ties or twists of wire.
Gah! I've written a book, I'm sorry.
I hope that was helpful and welcome to you and Sadie!