thanks for the support!
i know it may sound crazy but my husband and i are considering purchasing a small digital scale to weigh her with before and after feedings. last night i tried massaging my breasts more during her feedings, as well as skin on skin feeding and that seemed to stimulate her pretty well--i supplemented at two of her night feedings and she drank less than 1oz. each time.
yes, when she was weighed it was on the same scale but at different times of day. she also had a bm and wet diaper right before being weighed.