I think im am a little offended. Hubbys brothers girlfriend called my hubby to ask..?

shes finding herself a new baby daddy.. yours. Anyways either tell your husband its her or you, or tell her that she has one week ( out of curtesy from you..) or what ever time and then she needs to leave. This is not a long term solution for her. And how does she think shes gonna live there without you knowing?? lol