I have been thinking about her table top, so I was going to ask her husband to help get some plywood that'll end with 85 x 85 measurements, then sand down the edges and corners so there's no snagging of the quilt. I'd use a moving blanket that I have here to put on her table first, then the plywood, then we could work safely and comfortably.
I was also thinking that since they would want to help, I would make them some small quilted items as thank you gifts, pouches or maybe a small organizer that they can use and I would cover any cost for food.
I know these ladies well enough to know that once I showed them how to do it, it'll be a piece of cake for them and they get to experience a small portion of a quilter's life by going through the sandwich motions. Their usual attention to detail with anything they do would help.