Is it possible to do gravity feeds in spurts?
When we transitioned Hannah from the pump to gravity, we started at 10 mL every 20 minutes at first and gradually was able to get to where we are today (60 mL formula and 20 mL water every 45 minutes up to 240 mL then a three hour break). If you were able to start this sooner than later, perhaps you can build her up to make it easier to feed her.
But if she has to stay pump fed, then I hope others in similar situations can help you out with suggestions.