Mueller brand wrist brace I was able to find mine locally. Wore them for at least a couple hours every day for more than a year. Washed with my laundry and hung dry. They're still going strong. They have a stiff wrist support that keeps the wrist from bending so your partner may need some time to adjust to the limited motion, but they have little to no padding and are very comfortable.

I worked 7 years at starbucks and now have my own bookkeeping business so I'm very careful with my wrists. As a side note - google median nerve stretches. The same nerve that gets pinched in the wrist also runs up the arm and shoulder. Those helped me not wear the braces as much.

Best of luck to you both.