She said it was a fight over territory before. They both think they have rightful claim over the land and that the others should leave so they ended up creating a divide and now their is tension as greed builds over the land.
Ah never mind. Maybe something along the borders of the female alpha rebelling against the Alpha when their ancestors were once a large pack or something. Maybe she didn't like how he runs things or something and took all the girls with her?
Oh btw right now I'm contemplating sleeping (considering its bout 1:50 AM over here) or talking to you guys while finishing the details of this roleplay I've been thinking of starting, so like if I disappear randomly I've passed out.