Some of you may remember my past problems with SIL and my brother. He took 5K off me and wouldn't return it until I asked him outright last year before the birth of his baby as I knew he'd put it off for another 3 years. Then 2 years ago SIL's toxicity reached its peak when she told me not to talk to women richer than me at a wedding because they may ask about my husband's job and about where I live and stuff. I can't link the threads right now, but if you search my name they should all be there.
So thanks to MN and the brilliant advice, I've cut contact with them. It's been since November, after they had their baby and SIL said some more horrible things to me (can't mention as I've already ranted about them on my regular nn, and it would out me). She also insulted my friend at dd's birthday party. SIL was always desperate for a son ( backward Asian mentality) and now she has one she thinks she is the queen of everything.
Anyway, so a few months have gone by and life has been bliss. I'm so much happier, getting on we'll with dh, I'm pregnant again and our little family is having a beautiful time. I've made a few new friends from dd's school and after school activities, I'm finding it easier to mingle with people and am generally over the mental torture about my lack of wealth that sil put me through.
So last week I went to get my eyebrows done by my "eyebrow threading woman". I've known her for 3 years and she also cuts dd's hair. Her salon is practically around the corner from SIL's house. I sat down and she began and started telling me about how a woman had come in a month ago with a girl and claimed to be my sil. My heart started palpitating.
Firstly, the salon lady told me how the girl's hair was in really bad condition for a 10 year old and it was dry and knotted. It took her 30 mins to brush it out and then cut it. Then she said: "you know I couldn't believe she's related to you. She's the most bad mannered person I've ever met". Apparently, SiL refused to pay £10 for the haircut and was rude to the woman saying she hadn't cut the hair properly and that everyone charges £8 for a child's haircut. She then made random weird comments about whether the salon owner had an app for her salon through which she could make appointments on her phone 
. She then told the salon owner that she didn't have £10 so she'll have to take £8 or nothing, threw the money at her and stormed out of there with her dd. this all happened infront of her other clients on a busy Saturday morning.
I felt so embarrassed and kept apologising for her bad manners, but the lady is a good friend now and kept saying its not my fault and she was shocked that someone that horrible was my relation. I told her she's done the same so many times to other friends of mine. Sil also knows that I only get dd's hair cut from this woman because she cuts thick hair so nicely with trendy styles. I feel like sil has put down my liking for this woman's cutting style by being rude to her. Somehow she's got to me through this woman and is laughing at why I use this woman to get dd's haircut and my eyebrows done when she's so spectacularly tried to put her down.
I'm so angry. I wish she'd just stop trying to get to me through other people too. Why can't I just be left alone, even through cutting contact? AIBU?
Sorry it's long.