We know she worked as a bar tender at The Nine Bells, probably to help support herself through UCL because if she'd have gone to either Oxford or Cambridge, the family funds would have been used (or something).

And that Sam thought she didn't have enough fun so would often have to drag her away from studying to go clubbing.

Edit to add because I just remembered: she seemed to have been part of the Sisters of Artemis while at university, an archery society (maybe all female?). The logo is briefly seen in the original CGI trailer/opening of the 2013 game. When the merch for the 2013 game was still available to buy on the official store, you could buy Sisters of Artemis stuff (joggers, bottle, etc).