Having trouble finding some (to me?) basic information about the original event, i.e. the encounter in the changing room. There's so much out there at this point, I've probably missed it. Reports say Upton was undressing.
So: was Upton, like, on the other side of the room from Peggie and facing the wall? Somewhere near her and facing her and staring?
The first would seem to be getting on with your business and, yes, having no right to be there, but only one level of intrusion. The second is serious harassment.
How did that encounter unfold? Is it out there on the record somewhere?