It's not worth quibbling about how her powers work. She will be able to learn other people's special talents if she wants and whatever being a wizard usually is she can be that too. No wonder the person at the gate was confused.

"Thank you." She goes off towards where the books about types of people are.

The natural philosophy section is ... fairly poor by the standard of a modern library, but opulent by the standard of a place that has not yet invented the printing press. There are three bookshelves full of monographs, treatises, and compilations. There are also a pair of worn leather armchairs and a window to let in some light to read by. One of the chairs is occupied by one of those long silver fish, who is reading a book on a little stand and turning pages with tightly controlled puffs of air.

There is nothing that handily identifies itself as a complete guide to local sentient species, but there are books titled: Beyond the Mountains and Who I Found There, The Historical Populations of Sea-Peoples, The Hypothetical Subterranean People, A Population Census of the Unified Territories, and many more.

Alright, she'll gently pick a book and start reading. She'll try starting with the census. A part of her wants to pick up every book but that would be very marked and she probably wouldn't read most of them. So she'll refrain at least for the moment.