Thank you all for your replies. Yes Violet I did mean every other weekend. She goes on dates, and sometimes meets a close friend. Apart from once several months ago she always arrives home before her daughter.
She's had a really rough time, her ex assaulted her. The reason she left, and went on to harass her for several months after the relationship ended. This only stopped when she involved the police.
The first few months with us she hardly went out. She has a job she loves and works full time, I look after my GD. Have done this since she was 6mths old. She is saving with a view to living independently with her daughter. Again her ex makes this difficult. He is several years older than my daughter, is self employed and financially secure leading a comfortable lifestyle. He paid no child maintenance for the first six months until my daughter involved the CMS. With help from his accountant he pays very little. My husband does worry for her safety, he also doesn't understand her wanting to live independently. He would prefer she stay with us indefinitely.
He has a sister with two children who divorced 30yrs ago. She still lives with her mother, and he feels our daughter should do the same.
I think maybe I'll show him your replies, he doesn't listen to me but seeing other people's view may help?