She's in her mid 90's and in an assisted living facility. She's obessed with things missing (stolen then returned sometimes) ..now tonight she said she got sick at dinner and 'they put something in my food'..I just don't know how to deal with this and I find I don't say the right things and she gets upset with me because I don't believe her. I think she has dimentia tho' no official diagnosis but has been on meds for a couple of years..doctor hasn't officially said it. Don't know how to respond when she makes these accusations. I'm told there's no way to change her mind that she believes what she believes and no amount of talking can convince her otherwise..