Ok this is what I figure for single person in a one bed flat per month
Rent - 500
Council tax - 50
Water - 5
Gas - 5
Electricity - 5
Gas - 10
TV - 12
Phone/ Internet/Mobile - 35
=622
She earns £16000. After tax, NI and pension that would be approx £1066 a month.
So 1066-622= £444
So approx £444 a month for food, clothes and entertainment.
Meh, depends on the person. YABU to judge what other people can live on. She may want to save for a mortgage.