Is my baby still hungry?

My 32 week preemie came home saturday. I increased her feeding a little and she seems to be doing well. She eats every 3 hours using my breast milk. I am still pumping, since she has trouble with the breast. She takes the milk through bottles. Well, after im done burping her I usually lay her on my chest so we can just chill out. I'm not sure if she's smelling my breasts through my shirt but she'll start licking her tongue out repeatedly. I'll try to give her a bottle again but she won't take it. Sometimes I'll try to give her my breast when she does that, and she'll suck for a little and then she begins to cry. What does this mean? Is little one still hungry?