Whatever your body produces is good enough for your baby, don't worry about the numbers. It takes awhile for many babies to latch on properly but if you want to continue to breastfeed and you don't want your nipples to be sore you need to seek help with a lactation consultant or a doctor to get it worked it out. I promise it doesn't take very long. Because she is young I would suggest pumping very little, only for the times you are going to be working and only breastfeeding her when you are with her. Try single side feeding, let her empty one breast and then offer the other if she needs it, then switch for the next feeding. As long as you are eating well, drinking lots of water and getting rest you will make enough milk for her whatever that will be, her and her needs will actually determine the amount your breasts produce and it will go up and down according to her needs and growth spurts etc. You are doing a great job and keep the good work and don't be afraid to ask a nurse or someone for help with latching.