Over eating?!

I breastfed with my first daughter and she always stopped or fell asleep when she was nice and full. Now my 2 week old daughter has been breastfeeding and seems to spit up a lot!! I feel like she may be over eating, I know most people say that doesn’t happen but I can’t think of anything else. I’ve been keeping my diet super bland and no dairy really. I always make sure to burp her. She always wants to eat! I go back and forth with making her wait when I know she’s had more than enough and even throws up. But then I feel bad when she’s wailing and sucking on her hands. Just starting to think maybe it’s just a general reflux issue. Has anyone’s baby been like this?!