Your advice makes a lot of sense.
I have trouble standing up from sitting, and it helps when I say, "UP, UP". I have also taught my grandchildren to say, "You can do it, Mormor", and that helps every time, for some strange reason.
It is as if the brain has to hear the commands spoken out loud to process them, even though the commands are generated by the brain.
I have not thought to talk myself into walking, but I am going to try it right away. At this point there is no collaboration between hips, knees, feet or arms, and I don't just shuffle, I drag myself along.
I'd love to really WALK again. It may take a while before it works, but I'm ever optimistic. Hurrah for your sister-in-law - and for you.

birte