What a wackadoo. She has issues for sure. Not sure what they are but I'd try hard not to take it personally and sort of ignore her as much as possible.
I'd plan meals out. Not sure I'd trust anything she serve given her history! My dad's girlfriend went through 5 husbands (all dead) and he ended up in the hospital twice due to her 'lack of action' so I think some people really are just not to be trusted.