Hi Vise, if you can legally do so, I would just get the locks changed...it doesn't sound as though she will honour that boundary.
Equally, as others suggested, you could confirm that this is your own place and she is only welcome in it by invitation and when you are there.
Also, if she only has a front key and when you are away - is there an option to leave via the back and bolt the front, so you don't have to change locks but she can't get in?
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus
