Is your baby bottle fed? If your baby is crying a lot after every feeding and stops as soon as you burp her, it could simply be a buildup of air swallowed while eating. Bottle-fed babies in particular are prone to swallowing a lot of air during a feeding, which could trap gas in their stomachs and be uncomfortable and painful. This could explain the crying.
This article has more suggestions as to why baby is crying after feeding:
http://www.healthline.com/health/parenting/baby-cries-after-every-feeding