Lifting harness to assist her if needed going up the stairs and mitigate risk going down, in particular on her off days.
Already thinking of modifications cos I want the handle lower down closer to the back with my other hand free to hold onto the on the stair rail. Will also consider inserting a wood dowel inside the handle so I can apply more lift front or back. This one is $30 bucks and if it doesn’t work out bin it try another one.