I have a mom like this. I have to tell her to stop rearrainging knicknacks and pictures in my home. Stop planting "cuttings" from her garden into mine. Stop trying to do things behind my back and tell my husband you spoke to me and it's OK. She is a complete menace.
Oh--here's my favorite. She was 1 hour late to my wedding--yes--held up the whole service for an hour. She told everyone the reason she was late was because "nobody gets married at 4 in the afternoon."