Baby didn't drain breasts

So my little girl is full of a cold rn, she's not fed too good today but still done enough wet nappies. She fed for a decent amount of time tonight but fell asleep quicker than usual, I could feel she didn't empty me properly like usual... I have pumped and got 2oz from one side.. Does this mean she didn't get anything from that side?! As thought that was quite a lot to get especially at night.