breastfeeding

I dont know if my LO is full during breastfeeding. Latching was good. Everytime my LO breastfeed she will fall asleep and look very full. But after a few min she want it again and fell sleep. This repeating routine can take almost 2 hrs. After that 2 hrs she still want more milk and cry out loud till she refuse to latch, and i have to give her my bm through bottle. Is this normal? Thanx!