Im curently at Durham this is roughly what i get/spend
Get:
-The 3000ish loan to pay course fees
-3500 ish (non means tested amount) of maintenance loan
So i get rougly 1200 a term to cover accomodation, food, and 'extra curricular' activities 😛
Spend:
-Catered halls cost 1500 a term so you immediately into your own money here to the tune of 300 quid, plus youve got to add on whatever you spend. I spend roughly 600 a term on top of this (it cold be less, it could be more i relatively sensible with my money but not stingy)
-Rent in a house ranges from about 55-80 a week +bills +food (~50 a week)
My advice would be if it is you that will be funding her course. Pay her rent/halls and any other bills and then give her a sensible amount to use as spending money. Maybe 75-100 quid a week or so, about the average among my friends in the same situation.