I don't think there was anything wrong with what happened. The student went up in conditions that were suitable (Gusts aren't the sole factor in wx interpretation), the student didn't feel able to return to EGPG, so diverted into Glasgow.
A good call from the student and good training from the FI who gave her the ability to make decisions like that.
Unless you've got some sort of axe to grind, then this is a non-story apart from the fact that other students should learn from things like this and ask themselves what they'd do in that situation.
Well done all.