I have a Nadri bangle and the inside circumfrance is 8″..that is size large…I have a 71/4 in. wrist and it is the perfect fit..If I were ordering with your wrist size, I would order med…unless you like the bracelet to lay on top of your hand..Hope this helps..:)

My wrist is 6-3/4″ & I bought the average which fits perfectly. The bracelet I received is a bit of a squared oval shape –2-1/2 inches long and 2-3/16 wide”. I have a fair amount of wiggle room but not enough that it turns around so you can’t see the pave. The pave top stays in place on my wrist. The average should definitely fit your mom. My only concern would be that it might be a tiny bit roomy and not keep the pave on top of the wrist but I’d definitely give it a try. It’s incredibly unique, stunning, elegant and classic all at the same time! Definitely will get her noticed! Hope this helps.