Girls, is anyone here on IV? We're about two months in. She should be …

Girls, is anyone here on IV? We're about two months in. She should be eating 120 ml, but she eats 80 ml, last week she seemed to eat with an interval of 3 hours. After starting to notice that she asks every hour and a half again. In the end I do 120 ml straight away and she eats 80 ml and after a half hour she asks again and eats 50-60. Someone on IV should have a regime. What should we do? How can we make her eat 120 ml at once?