So I pump after every feeding from 9am til about 6-7pm. She feeds quite a few times through the night. I still feel let…

So I pump after every feeding from 9am til about 6-7pm. She feeds quite a few times through the night. I still feel let down but my boobs never seem full unless early morning. I only get 2-3 oz a pump each time. I pump both sides and then combine the milk. She seems full after feeds but I still feel like I'm not getting enough when pumping.... Is there something I need to do, or am I producing just enough for her to eat and then just enough "left over"? I am loving this breastfeeding journey and want to make it a minimum of 6 months.... Any thoughts or ideas please?