My MIL is going through boxes she offered to store for me a few years ago. I can't remember what's in them but they are overflow from uni that I couldn't take home with me in the baggage allowance, so who knows! Without permission or any alert, she has started 'sorting through them' and guessing what I may like to keep or get rid of. It doesn't help that the relationship is at its rockiest yet because DH has recently had therapy that opened his eyes to a lot of dreadful things in his childhood that she was responsible for, and that he noticed her doing to our DS. She thinks I'm behind it all though, even though I am not, I am only quietly supporting my DHs response to it all ( which I don't entirely agree with). I don't usually stick up for myself with her but I did this time because she took some photos of a couple of the contents and both items were really emotive for me so I told her it was rude of her to go through my stuff and I will go and fetch the boxes from her in a couple of weeks. She has said that I was rude to challenge her, has conflated my request for privacy with whatever is going on between her and my DH, and has now stopped all communication. Aibu or is it rude to go through people's stuff without their permission like this?