What does the £750 cover?
It's very "how long is a piece of string".
£750 in a cheap area just as rent for a small room to share with your daughter, you pay your share of council tax and electricity, gas, water etc. bills? Shared family bathroom and she limits your use of hot water, you buy all your own food and pay separately for any entertainment packages, WiFi, don't use anything of hers? Too much.
£750 all in for a big ensuite room or a separate room for you and one for dd, in an expensive area, including bills and food and WiFi and perhaps a TV in your room with use of a multiuser Netflix/ Amazon prime package, she takes in your parcels and babysits once or twice per month - a bloody good deal.
If you think its too expensive though you move out
If you can't afford to move out that suggests it's a good deal as it's cheaper than anything else you can find!