My XAH's wife will not let him be in the same room as me or even in my driveway w/out her being there (for kid functions). It's crazy. It's because she is so very insecure. She then gets pi$$y that she has to attend functions she does not want to b/c she won't allow her own husband (My XAH) to attend w/out her. He also finds any which way to text me about something. I just don't answer.
I would simply ignore her, and if she is ever aggressive I would call the police. Unfortunately, you are on public property and cannot do much about it in the mean time.
Sending you huge hugs and lots of peace.