If you're perfectly happy now, then don't let this woman bother you. She's only making a fool of herself if she continues to try to trigger you, when this all happened a couple years ago and he hasn't made any other moves to be with her.
If she does keep it up while you're at this hen party, pull her aside and tell her very firmly to stop. Remind her that this is the bride's weekend and she should be mindful not to create drama. Then walk away and ignore her.
Does the bride know what happened?