my mom likes garden decorations, so usually something related to that. last year I bought her windchimes (not like the tinny sounding ones that are small metal rods, but the long, heavy tube ones that make the super ambient rolling sounds)
idk, if anyone needs ideas, and your mom/wife has a backyard and likes hanging out back there, I think windchimes are a good option. just don't get the cheap tinny sounding ones (they are SUPER easily tangled if its windy)
and it's cool cus they'll usually tell you what key or notes the chimes focus on, so you can buy other chimes in the future that match the key and create a cool atmosphere in the yard
(side story, when I was a pizza driver, I'd deliver to this old lady whose yard was full of wind chimes, those yard spinner things, and sun catchers. I loved delivering to her house cus it was like stepping into another world)