She has done it to goad you into acting against her so that she can report it to the police and get some attention. Perfectly normal. This is what most domestics amount to.
Are you making contact with her at these events?
But you do?
Always or just sometimes?
Ok. So do you make contact with her?
Yes, but when you see her do you make contact?
Approaching her at all would be potentially an act of vexation whatever the provocation. Being in the same location as her would not. You have no duty to avoid the same venues but since she has asked you to stop making contact with her would be an offence. It's not stalking but it could be harassment.
The only thing you could do is turn the whole thing round on her and tell her to stop provoking you or you will report her for harassment but the reality is that the police probably wouldn't be interested.