feeding/pumping question for my almost 7 week old daughter?

My daughter is 6 weeks and 5 days old. I am feedig her only. I have a bunch of milk in the freezer saved from pumping the extra milk I had when she wasn't eating that much yet. Today i wanted to pump to see how much I can get and I fed her a bottle from the frozen milk. I gave her 4oz. But she wanted more and I gave her another oz making it 5oz. Shes kept it all down and seems satisfied. When I pumped I got 5.5oz. Does this mean thats how much she eats when I feed her? My feel the same after I pump vs. feeding, squishy lol I never thought that she would eat this much!