Middle dd had a very bad time at her previous school. Her closest friend was regularly physically and emotionally bullying her with another girl who they'd started playing with. They were in Y3 and Y4 at the time.
This went on over a long period of time and caused dd a lot of distress. She still struggles to trust girls her own age because of this.
The school couldn't resolve it and the bully's mum (one time good friend) refused to talk/acknowledge the problem. This meant dd had to leave her school and start afresh. It was very disruptive to her education and she lost the friends she had at the school.
Since then, the girl's mother has contacted me numerous times to say how her daughter missed dd/wants to see her/has written her letters. I've never replied to her as I am trying to move on.
Today they have come to our home and knocked on the door. We were in the kitchen so didn't answer the door but they've posted a letter through.
My dd is very soft hearted and would probably forgive this girl but my feeling is the whole thing is toxic. I also feel angry at how horrible this girl was. AIBU?