Growth spurt??

My daughter has been very fussy the last few days and starting yesterday all she wanted to do was eat and sleep. She only ate about a total of 6 times yesterday between 3 to 6oz each feeding, fell asleep at 845 and slept until 6 this morning. I tried waking her up to eat around midnight but she just wasn't having it. Is it okay for her to sleep that long without eating? She is 11 weeks old today.