I'd leave it in the past. If you do reach out and be friends again it won't be the same.
I think you have to trust your past self- there is a reason you decided to move on and a reason she continues to decide to stay with this man.
Definitely leave it, I tried contacting an old friend of mine knowing that part of her was in good intentions of me but then after she coaxed me to leave she ended up being a totally different person. I did end up messaging her but she never responded. Which I’m glad for because if something makes a friendship die is usually meant to happen. We meet new people and we move on and sometimes it can be for a short while or a long while. The ones who stick are the ones who will see every part of you but still accept you even if there are some not so good parts which she didn’t seem like she was doing when she would go report off to her bf about what you would advise her with.
I'm sorry but it sounds like she was creating drama and I would leave it in the past.