I understand where you are coming from, but you have to be wary that you are not saying something that could be taken as patronisation. She is in a very vulnerable state and is possibly so embarrassed by being taken care of by her child, that she is unable to express her gratitude. Her emotions may be caused or exacerbated by the disorder but that doesn't make them illegitimate. She is picking up on the fact that you are changing the way you speak, and trying to steer the conversion. This makes her feel like she is being treated like a book. This is a tricky situation as, like you said, she is most likely manic from the move. You are doing everything you can to help her, but this could be a period where these struggles and arguments are inevitable. As redbandit said, group therapy together sounds like a great idea. I hope things get easier for you in the future.