In the case of quilt display racks, there really isn't a brand one that's the Cadillac of display racks. Most of us who have them have bought them from woodworkers who were selling at fairs, art-in-the-park events, "main street days", that sort of thing.
That said, I personally feel that quilts display better when they are hung full exposure on a wall or over a banister. There are many options for hanging quilts on a wall. Google "displaying quilts on a wall".
The next best way is on a tall rack like a ladder where there are many rungs for folding many quilts over. The best ladders are very old wooden barn ladders, often wider at the bottom than the top, and very hard to find. Have one made for her, that way you can choose the finish, width, height, and number of rungs.
"Foot-of-the-bed type quilt racks do not show off the quilts well, with only the front and back quilt showing any of its design; the one hanging in the middle is virtually hidden.
How nice of you to think of this for your mom!
Jan in VA