sister-in-law

Today I went out with my sister-in-law to buy an outfit for my mother for my sister-in-law's wedding. Up until then, everything was fine, until my mother got out of the car to talk to my aunt and my sister-in-law started a conversation with me. She looked at me and asked: "What psychological problem do you have, 'dead name'?" I looked at her and said: "I'm bipolar like my sister, why the question?" And she said: "You don't have any of that, it's all in your head and you need a good wash." I just replied: "If you think so..." MAN, I WAS SO ANGRY. First, she doesn't know me well and always tries to give her damn opinion on everything as if she knows me and knows about my crises or outbursts. She's only just now entering our family and always makes me choose "feminine things" without taking my opinion into account, all just to please my mother. Second, she used to talk badly about my mother behind her back, saying She was a gold digger, an old woman who dresses like a young girl [my mother really likes those kinds of clothes and she looks beautiful even at 53, she's well-preserved] and now she acts like she never said a bad word about my mother. This makes me so angry and upset. She doesn't know me, she spoke badly without knowing me, and now she wants to give her opinion on something she's completely ignorant about. Anyway, just a rant, bye.