Stunned, I don't think asking for the key is necessary, but if you really are uncomfortable with her coming and going at will, have the conversation with her. Tell her that you since she no longer lives there, that you would like her to let you know when she needs to come over so that you can plan accordingly.
If she objects, just point out that you would not show up at her place unannounced, and you would like for her to reciprocate that level of respect.
Yeah you're probably right asking for the key is not really needed. I'm just more concerned that I'll be out of the country soon (on a trip WE booked a week before she left!) for a week and I don't want her in the house while I'm gone. So I will be talking to her about that at least. And asking her to let me know before she stops by for now on cause she came by again today while I was at work. She's getting her cake and eating it too just coming by whenever she wants when I'm gone. I almost feel like I'm making her exit the M too easy for her just the way she wants it.....
