Occasioning ABH Allegation?

What matters is how long she has been your ex. If she still lived at your house because you just broke up and you tried to force her out, that would be domestic battery, as she has a right to live there. On the other hand, if she has no LEGAL right to live there, then she was trespassing and you should absolutely get a lawyer because this is something that will most likely have to get dismissed by a judge.