Progress continues. Long distances are still tiring and slow but doable; minor inclines up are now doable also. And over the weekend she demonstrated that she could walk without the shoes and any aid such as a cane.
The wheelchair is slated to go away soon, but we will have to get her a special chair for the dining room table; the chairs in this 400+ year old set are too high and have no arms. (This is an issue related to her back surgery, not Guillaume-Barre Syndrome.)
More progress. A couple evenings ago she went down the stairs so quickly I was almost running to keep up (I was carrying her suitcase for an overnight study on some sleep issues that got put on hold when all this took place). She's starting back on her old job as a merchandiser, which requires some walking.