What you pump out might not b what she is drinking. In fact bby can pump out more milk frm sucking compared to breastpump
If the number of wet diapers r sufficient, tht means she's feeding well. At times wen babies go thru growth spurt, they want to feed more often. Sometimes every hr.
However, you can also check whether she's crying due to gas in the tummy? Do burp her after every feed