Will you approve a sleepover for a 12 year old girl at her friend's house?

My 12 year old daughter wants to sleep over at her friend's house. I said no, because I don't know her friend's parents and I don't know the background of the child's family. And now, she is mad at me because I wont let her have a sleepover tomorrow. I said to her she could stay there from 1:00 pm to 8:00 pm, but no sleepover. She is still not happy with it. My husband is not helping at all as he just keep on saying "yes" to sleepover, contradicting me once again. I am upset and not happy. I am just avoiding the topic now and put myself on a timeout. 😭