It is difficult trying to balance the right I think your W being super busy is normal, but more importantly it is out of your hands. What does NMMNG say to do about those things?
Well, the sticking point here is that I don't have any evidence that she's *not* doing the work she needs to do, either. I'm only assuming what she's doing at this point; the only real indicator I have of this is MC, which she agrees that we should still attend.
Long story short and to answer your question, NMMG would simply say to set boundaries (I've already said that I refuse to be a Plan B), and to let go of things you cannot control, such as her actions and motivations.