Fellow school mum too much

Please don’t grill me for this as I’ve been told I’m a bitch by someone who didn’t know my circumstances and why I feel the way I do. I should also add I don’t think of myself as too good for others or anything like that, I have quite low self esteem actually and don’t think highly of myself at all but I seem to attract some kind of crazy behaviour.

Years ago while working in retail I met this other woman who was extremely friendly and kind, we hit it off and only got to exchange numbers before things got really bad. I should state she didn’t work with me. Long story short she suddenly started going all weird, she dyed her hair the same colour as mine and even got the same cut, she got a similar tattoo to mine, she messaged me constantly asking if I was working and where I was if I wasn’t. She would somehow find out where I was and rock up pretending she didn’t know I was there and then completely snob me but then abuse me later. It got to the point she found out where I lived (assuming she followed me home one night) and rocked up to my house drunk one night abusing me, threatening me and she grabbed a weapon as I tried to get her out of my house. It ended with me injured and her getting charged and I’ve been pretty traumatised since. Anyway, my child made a friend on her first day of school a couple of years ago and me and this mum made “friends” but I struggle to open up and connect with people since my ordeal. But she started parking right next to me every day no matter where I parked, she would run to catch up to me if I was heading into the school and she would wait out the front for me to come and then follow me inside the school. She also dyed her hair the same colour as me after saying how much she loves mine which was a trigger even though I’m sure she didn’t intend any harm. And everything I said I liked, she said she loved. She’s even gone as far as to buy my child little gifts and new drink bottles so of course the new ones I have brought for her are no longer good enough because she has to have the same as her best friend at school. Fast forward to this year and over the Christmas holidays, this mum messaged me asking if the kids could have a play date. I told her we were on holidays and I’d let her know when we were back but we’d been back only 2 days before we were invited on another holiday with a family member to their holiday house so it completely missed my mind. She messaged again a few days later asking and sounding impatient and I told her we were away again and I apologised and told her to message me the day after we were due back. I never heard from her and I assumed she was pissed off with me. A couple of days later while still on holidays I found 5 missed calls from her and an empty voicemail which lasted 2 minutes. Not a sound. This also triggered me. I let it go and tried to enjoy my holiday but school went back this week and I went to pick my kid up from school and this mum was waiting right where I usually do. We had a quick hello and she started telling me about her job and how much she earns. (Every conversation is about how much money she earns which I find really strange). Come today and I parked around on a side street to enjoy abit of a walk and suddenly her car flew into the park infront of me and she quickly got out and come over. She then whinged the whole time about our kids other friend at school who apparently drives her nuts and then she complained about the mum and how she does this and that. Then she brought up how much money she is earning and how she gets free access to this clients house and their spa, pool etc. by now I’m really triggered and trying to leave to go get my preppy from inside the school. On the way back to our cars she keeps going off about other people, other kids and all the negativity puts a damper on my mood (as any of you would know when you are around someone negative). She then tells me to message her over the weekend so the kids can have a sleepover. Today I’ve had enough. I honestly can’t deal with this mum anymore, she’s coming on too strong and while she could possible react differently if I told her my circumstances, how do you even tell someone you barely know about your past. The only people that know are my councillor and close family. I’ve been as nice as I can to her, engaging in conversation but she literally follows me everywhere at the school and doesn’t stop talking about her earnings and how certain people drive her mad. I’ve tried to distance myself a little without being obvious and mean and due to my retail past I’m sometimes too nice to people which totally invites them in. but since my ordeal I’ve changed and I can’t let people in or even too close to me but I still have to be nice to everyone. Even seeing her car triggers me and I instantly feel in a bad mood because of the way she talks about people all the time. And now I’m wondering about what she really thinks about my child and if my child is even safe at her house.
I feel extremely uncomfortable now and I don’t know what to do. It’s getting to the point I would rather send my child to a different school than have to deal with all of this.
Please be kind, I have a lot of trauma and this lady is bringing it all back for me. I’m working through this with my councillor but it’s so hard when people do things that trigger me and remind me of what happened in my past.