3x5 is a decent size. I have no experience of these things at all but I would think that removing the atmospheric pressure by having the bone re-fitted would be beneficial for her recovery. See the “My Amazing Brain” film I linked under UK AVM Support.
It’s amazing what is considered “elective”, isn’t it? My original treatment for my dural AVF (a specific type of AVM) was apparently elective, too, though it didn’t feel elective at all to me.