W.N.
My only advice is not to worry about it. At 2 1/2 it may just be hard for her to wake up at night to go. My daughter is 4 now and it took her several months after her daytime potty training to be trained at night. I didn't put pressure on her, just limited water just before bed and had her use the potty just before bedtime. Then I just left her in pullups at night only until she had several dry nights in a row (she was about 3 1/2 when she consistently was dry through the night). It was exactly the same for my older daughter. I'm not sure there is any reason to rush night time training as long as she is trained during the day. Why put the stress on you and her.