I think she has to have been up in the tower at St. Mary's

Urglesquish. Now I'm going to be wondering all afternoon if she was there or on the roof of the Rad. Cam. I think maybe the latter (for even more Gaudy Night associations), but I may be wrong, or it may even be somewhere else entirely.
"...the twin towers of All Souls, unreal as a house of cards..."

Anyway, feel better! and sorry to hear the doctor was unhelpful. I hate that.