Two cats not getting along.
I know that this topic has been revisited quite a bit here, but I need a bit more personal advice for my situation. I'll try to be brief, but I'm also going to add as much detail as possible.
My resident cat, Maple, is a 6 1/2 year old spayed female. About six weeks ago, I adopted Mahli, a 1 to 4 year old spayed female. I was doing the usual introduction: putting Mahli in a room by herself, letting the cats smell, then see but not touch each other. I gave Mahli as much attention as possible but after only two days of this she gave me the slip and ran into my bedroom, which is Maple's home turf, and hid under the bed.
She came out from under the bed a short time later, and I snatched her up and put her back in her room. Mahli cries when she is alone, and craves affection. As we all know, cats can be slippery little things, and the next day she once again bolted into my room and hid under the bed. Maple seemed surprisingly calm about this, and I didn't want Mahli to begin to avoid me thinking all I wanted was to continue to put her in a room alone, so I let her stay under close supervision.
Fast forward to today, and it's been a bit of a bumpy ride. Maple and Mahli have never really fought, but Maple definitely keeps Mahli under her thumb. One second they are within a couple feet from each other getting petted, the next second Maple has chased Mahli under the bed while swatting at her. Maple never hisses anymore, but Mahli will growl and hiss if Maple looks at her the wrong way.
To further complicate things, I'm moving this Sunday. I'm only moving a couple minutes away from my current apartment into a bigger one, but it's another stress added to them. I desperately want them to be friends, or at least live side-by-side without fear or aggression.
Once I move, should I begin the introduction all over again? If so, how can I keep Mahli from being so lonely and crying the second I leave her? Should I intervene when Maple chases and swats at Mahli, or let them work it out themselves as long as no one is getting hurt? I've heard of Feliway from reading these forums, should I buy a diffuser and pre-treat the new apartment before moving the girls over?
Other notes that may help: They both have their own litter boxes, food dishes, and water dishes. Both of them use both litter boxes and eat and drink from whichever bowl they feel like. Maple will watch Mahli eat and drink without a care in the world, the chasing usually happens after I pet Mahli too much for Maple's liking. They will sleep about two feet from each other on my bed with me in between them. Maple has been an only cat for about two years, after the death of my older cat that Maple bonded closely with.
Any help at all will be greatly appreciated. Thank you!