Yeah I've only seen cheap rooms such as 9.50GBP/night for a 6-bed female 'dorm.'
Private hostel rooms I saw were 22.50 GBP/night.
My friend was staying private in a hostel in Glasgow one night and she and the girl she was there with were quite scared (but that could just be them..) in it, and they weren't sharing with strangers. Maybe i depends what kind of girl she is [is she easily frightened, because it may just be my friend is].
I did find a guest house room for 16 a night...it's a start
That's great - I hope she enjoys her stay!