Set the right precedent. Don't do shit. She's not your mom. When your kid is old enough she(? I think) will make stuff for your wife in school.
I almost sent my mom Ghost Trick for the second year in a row. I was ready to order it, and I thought... didn't I already give her this? When I checked my order history, it was exactly a year ago. I'm running out of games I know she'll like, so I sent her a Kindle gift card instead.