Today, for the first time I tried sitting next to her on the stairs while she was eating. (Thanks to my friend, Dave, for the suggestion!)
She was very hesitant at first, but gradually did come up to the landing to eat, sitting just inches away from me. I made sure to keep my hands in my lap and made no attempt to touch her.
Sometimes she would get spooked and run half way down the stairs. Then she would come back and continue eating.
My plan is to just do that – no touching – for a week or so and then see if she is ok with a slight touch.