Using cardboard, I came up with a curve that worked best. Had the glass cut for $24.00. Whereas the glass is 1/4", it fit into the routered groove in the back splash so I ran a bead of silicone adhesive in the groove and installed the glass. I tape it the wall to hold it tight overnight.
This morning I gave it the tug test and I couldn't get it to come off the wall so hopefully it will stay there going down the road. Joyce is happy again!
A little better organized for when we are parked for a while.