You almost never know how your actions at any given moment can impact someone's life. How awesome!

And how awesome of your friends to help you? That's wonderful!!

People will say lots of crazy things in grief. Although hurtful, and you should just tell her so (calmly), I don't think you should take that seriously. She is always asking you to move in with her. She is grieving her husband. How she feels about your brother? That could be different from what you are saying. Hugs.