Since she likes Olive Garden, get her a certificate for that restaurant with the idea that she could treat a few friends.
If she doesn’t already have a subscription, she might like a subscription to TV guide.
What kind of foods does she like? You can find some nifty sites that will send you MIL some fancy cheese, or gourmet cookies or cupcakes.
Dean and Deluca has a lot of good stuff.
Or Cherry Moon Farms
Here’s one called igourmet that specializes in artisan cheeses.
One of the best cheeses I ever tasted came from Cowgirl Creamery
The Winchester Cheese Co. specializes in fabulous Gouda cheese. I had some with peppers in it that was divine.
Maybe she would like something from the Carolina Cookie Company
Not sure where your MIL lives, but most areas have a service similar to “Susan’s Healthy Gourmet” where you get yummy pre-made meals sent to your house. You could get her a month’s subscription/supply or however it works. You’ll probably have to find a place in her area, though.
And last, but not least, if she has a favorite TV show, you could get her a DVD of a season of that show.