It sounds like there's nothing preventing you from politely asking her to leave.
My situation was a little different, but I asked my wife to leave and she did. I've forgotten what I said to her. She says that I never said "get the f*ck out" but that's what I implied. I'll go with her version because I honestly don't recall. I did giver her a date to be moved out. She did push back a little; she said it'd take a while to schedule the movers. I told her that wasn't true (or something to that effect). She missed her move out day by one day.
It can be done, but again, our situations are little different.
