i dont really have much advice but just wanted to comment on your kitty, she is so gorgeous, she sounds like a real little spitfire, another wonderful all black girl.
Maybe an older kitten, a boy would be best, i have been told get the opposite sex, depends really on the cat u adopt, as to who will be dominant,in my case i had ash first , when sooti arrived he was fine for a while then he became dominant over the older bigger and much more aggressive cat, much to my disbelief, now with lexie, ash has taken over being the BOSS. so who knows.
Jenluckenback is very experience and has many cats , maybe she will c your thread and reply. good luck anyhow.