Baby that age has a very small stomach and tend to feel full very fast. And if your baby has jaundice, she will tend to feel very sleepy. As long as she has about 6-8 diaper change daily, that's already great! And you're lucky you can sleep longer. Take this opportunity to rest also. When she's not latching, try to pump so you can build a stash too and your breasts knows that you need to keep supplying milk.