I'm genuinely looking for advice on how to handle this situation. I'm too close to it to trust my judgement right now.
Brief background: DM is very loving and generous, however has always had tendencies to overstep the mark and interfere. I won't go into detail but we have, over many years, had HUGE rows about this (although usually I just try to ignore and let it pass, managing situations so that they don't happen again).
We've just returned from holiday and, despite me asking her not to (I was VERY specific), I've found from neighbours that she was at our house more than once while we were away. The last time she was there she left bread and milk, which was kind but my suspicions side says just a way to cover for herself. I don't know how many times she was there. Also our burglar alarm for switched off. We are really annoyed about that as we don't know how long it was off for and can't trust her to tell us.
So dinner at hers this evening. Do I:
A) call her on it, she jumps to the defense (read OFFENSE) and we have a war on our hands
B) day nothing, let her away with it but inwardly seeth, then change the locks
Or C) something else completely
Just to add for context, she's not some lonely old dear - she has a happy marriage, lots of friends, hobbies, etc