Cow time!
I wouldn't really say I have her story wrapped up, it's more that I don't really have a single narrative in mind. I really like the idea of having her deal with all sorts of weird things during her tenure on Earth.
Also, it's interesting you bring up other breeders! The way I've got it in the story, there's usually only one Breeder per planet so as to make subterfuge easier. BUT I was considering giving X2 a kind of "rival" who'd call her up and taunt her about any "performance issues" she'd be having. Though that's an idea I'm still playing with, I don't have anything fleshed out yet!