new born not eating

My baby is either breast fed or I pump and give her milk in a bottle. She doesn't properly latch on all the way and I make a lot of milk to the point where my boobs and armpits  hurt so badly so I pump the milk out most of the time. But I noticed today for the first time she's not really eating. She was up all night finally around 7am she slept all the way until 1:30pm. Tried feeding her her bottle and she just spits the milk out, tried giving her breast and she pushed away. Not sure why she's not eating. She's also not crying or anything . She's very calm .. eyes open just looking around. Should I be worried ? Or is this normal?