My baby is co sleep with me, When should I separate the room with her?

It's your own choice. For me, my kids co-sleep with me until 5 and 2 years old respectively. Firstly due to there is no extra room for them and I find it more convenient to breastfed them at night when they were young. It also depends on how ready is your child to sleep separately from you. My no.2 is more ready to sleep on his own compared to no.1. I think it's partly due to my no.2 weaned earlier from latching.