What do you get an unpleaseable grandparent?

My mom has never liked “ornaments”, or things of such nature...she has always said when people get her cute ornaments “oh they should have just given me nothing” or “they could have put it towards a gift card” (if the gift card amount is not enough, she also comments on it isn’t enough to buy anything). Anyways, she’s like this. But my MIL, she loves anything I get her. I got her and FIL, two mugs with pictures of my son and an ornament with the names and birth dates of all 3 Grandchildren.

I am at a lost for my moms gift....she’s just not grateful, and I am not wanting to spend money on something she’ll see as “useless”