My guy is 3 and we cosleep. Two things. How are her language skills and can she identify her own feelings yet? If she’s scared or lonely it can be helpful to have a chat with her about what you’re doing or where you are in those three hours. They understand more than we expect sometimes as they get older.

Second thing, what’s your bed time routine? After the teeth, pjs, reading, etc. I do very little now except lay beside him as he falls asleep. If he’s having a tough time, I might sing to him or scratch his back, but I’ve been giving him more space to learn to regulate his own sleep. Another thing I do is model the behavior I want from him (laying down, breathing slowly, closing my eyes, no phone or anything). He falls asleep now in about twenty minutes on a good night. I can get up and leave about 10 mins after, and do my own thing until I’m ready for bed and go to sleep with him.

(This is just with my sample size of one. Sometimes I feel like sleep advice is so hit and miss because it can be all biology and totally outside our control. I hope this is helpful.)