You might try hooking her up with a graduate of nicu who has transitioned home to get some perspective on the current problem.  If she is willing to take 3-4 days to concentrate on pumping, she may be a candidate for Reglan short term to give things a boost.
I tend to approach the whole thing from "let's not shut any doors before you are ready" and if she keeps pumping , even this much she is contributing to her children's health and may, possibly be able to increase supply later.  This mom sounds like she has a lot going on-she needs more support, probably less advise.  There may be more chance of postpartum depression due to the situational stressors, you can check for that if you get to see her.  Good luck