When’s the first time your lo had a sleepover with grandparents?

So my mother in law called me and offered to babysit my lo over the night so I can get a night off. I’ve never had a night away from her and I’m going back and forth whether or not I should let my babe stay the night. She’s 11 months and is now formula fed and sleeps through the night most nights. I’m just worried she will freak out if I’m not there if she wakes up. I also think I won’t even be able to sleep because I’ll be up all night thinking about her. What should I do? Would it be beneficial for her to get a little independence away from me?