I doubt the cabinetry in the eating area is original. Someone kind of killed the dining room with a kitchen remodel at some point. Does she need all that hutchery and cabinets in there?

round pedestal table will be easier , not necessarily more capacity. When we visited one grandma as kids they used a drop leaf table in living room for more capacity than the kitchen table , as it was a small home . when we left , table went back against the wall, and leaf placed down. is there an end of the living room than can be "flex" dining space? long and narrow farmhouse or trestle table right in the middle of the space shown will allow a bench on one side w small people using that and chairs on the other side: that sort of table can be found or have built fairly long and narrow to your specs. Let's dare ask? How many seated people must she entertain? Maybe best is to get food and seated people setup in the other room[living room or family room] and adjust to that with the way of serving that she can realistically do.