Whereas I think this is information Coworker was in the right to make sure she'd have, both in general (knowing who swiped right on her) and about the Friend if they popped up. Especially considering that women get blamed no matter what we do so we might as well be forearmed with as much information as possible. Maybe nothing has happened between 2 years ago and now. Or maybe many small hard-to-grasp things have "happened" and Coworker could finally take this particular one to HR. Based on patterns of harassment I've seen over the years I know which way I'd bet.