Do you have a gram scale? If so start weighing her daily same time of the day-this way you will know if you are feeding her enough if she does not lose weight-if not, then feed her at least 60 ml a day if she is also eating on her own. Her gut most likely hurts some, so more frequent feedings with smaller amounts is what I would do if you can, 5-10ml per feeding several times a day. You also should get some baby gas drops-simethicone is the ingrediant you are looking for and have them on hand in case she gets gassy. I would, if this was my chin in this situation, give her a dropper full or so twice a day-the ingrediant is inert-it is not absorbed by the body and stays in the digestive tract so it won't hurt her if she does not need it but it will help with any gas bubbles she may get.