I want to return a dog to the shelter because she's not very friendly.
Why do you think the dog isn't very friendly?
She doesn't want to play with me or spend any time with me.
It can take a while for a dog to warm up to a new owner. Do not give up so easily on it.
Fine I'll give her another week.
A dog from a shelter may be more shy than other dogs. They need more patience than others.