I think it's a power struggle thing. I mean, if you manage to get everyone to hate the Alpha Female, and manage to do so while apparently being really caring and sympathetic to everyone, you may well become the Alpha Female.
Of course, there are a few problems with this:
a) The moment you hit an adult level of intellect you realise it was completely insane,
b) If you become the Alpha Female, someone else will immediately try to take your place through the same methods
c) If it backfires, you've gotta find yourself a new pack or spend an entire year grovelling
and d) usually there's a more popular option than you to replace the Alpha anyway.
There ya go, a girl's perspective on it all, using wolf terminology. Enjoy.