Hello, congratulations on your daughter's offer!
All colleges have some students who are not party people (like me) but still get on well in the university accommodation, although sometimes it may be difficult because of the noise from flat parties. She also doesn't have to drink and no college will force her to, so that should be okay.
If she loves to cook and wouldn't mind going to a self-catered college, that would be my suggestion. I honestly love cooking too and always knew self-catered would be my choice because I can have control over my meals. Self-catered colleges include John Snow, Stephenson, Josephine Butler, South. Castle and St. Cuthbert are partially self-catered.
All law lectures take place in the Teaching and Learning Centre (TLC) to which hill colleges are closer compared to the bailey colleges. Hence if she prefers not more than an 8-minute walk to the TLC and a self-catered college, she could choose from amongst John Snow, South, Josephine Butler and Stephenson. On the other hand, if she opts for catered and wants to live close to the TLC, St. Mary's and Grey are viable with Mary's being literally opposite to the TLC.
If you scroll down on this page, it will take you to a table where you can find the characteristics of different colleges and that should help too:
https://www.durham.ac.uk/colleges-and-student-experience/colleges/#d.en.467132Hope that helps

-Himieka (Official DU Rep)