J.N.
It's normal for babies this young to eat often. Their tummies are very small, and can only hold so much, and then it digests and is gone. And every time she goes through a growth spurt, she'll go back to eating every 2 hours. And the fact that she's only eating 3 times at night means a lot ... she's on the right kind of schedule (night sleeping, more awake in the day), and she seems to be getting plenty in the day. Just keep going with it, she'll be fine :)