To be honest without sounding harsh. You shouldn't have got the kitten. Everyone knows how territorial cats are, and mentioning the hunting shows how instinct driven she clearly is. OK, so you can't take the kitten back, although if you had a friend who might like one, I would even go as far as...
I think provided you get her neutered, if you haven't already, I don't see why she wouldn't stay like that. It's clearly her natural way. The reason I mention the neutering, is that the females can tend to get moody as their hormones fluctuate, a bit like human women. When you neuter them, this...
A lot of people have said, she's just not normal. She is really nervous, but very sweet with me, so affectionate. Basically, it says in most forums, that this is often down to them being taken from their mothers too young. But when we got her, she came with her mother, we had them both from the...