NICU feedings

Hello have a baby girl in the NICU. She is in there for eating issues. She's currently being bottle fed and ng tube feeding the leftover she doesn't finish by bottle. She needs to eat over 80 percent to discharged, and has been in there for 2.5 weeks. She was doing well hit 81 percent but need to be over 80 for two days. After she hit 81 percent her next two days drastically dropped to 45 and 50 percent. Now they are even skipping feedings because she's not up. Any advice on what I should do? Just been waiting for her to come home to truly feel the family experience.