In fact, if it folds flat, you might think about her taking it on the plane and asking crew to stow it in their coat closet. Just in case. While the chair is usually there when the doors open, there have been a couple of occasions when it was getting to 20 mins and no chair that I was glad I had my cane even though the chair took me to the aircraft door. It meant I could walk to the terminal to wait and let the crew get off. Crew have been great about getting my carry on up the jetway when this has happened.