She was enrolled as a student at the Unseen University. How come she's never mentioned in later Wizard books?

I don't think anyone can really answer that apart from Terry himself, perhaps because she was more of a plot device than a proper character?

Reading Equal Rites at the moment ha. What are the chances. Well, they're probably quite high, but hey still coincidental.

She was quite a character. But thinking about subsequent books, she wouldn't have fit in in many of them. Would love to see her get involved with a Rincewind story somehow though. That'd be pretty interesting.

There was a rumour that she was going to appear in 'I Shall Wear Midnight', an upcoming book...