I'm sorry to hear your mom had a stroke. That can be pretty scary for her and for you and the family. Will she be going to rehab too? The rehab therapists can make some recommendations based on your mom's condition, i.e., did the stroke affect her speech, motor skills, memory, or a combination.
Some stroke rehab departments/centers actually use iPads and have special software to help with the recovery. I read about a couple today and it looks pretty interesting. Playing card games like Uno I've read can also be helpful, or even chess, but it all depends on her status at the time.
Were there games she enjoyed on an iPad or non-tablet games before she had her stroke? Something that's familiar to her might be a good start.
Also take a look at stroke.org to see if there's recommendations there that might help.
Hang in there and I hope she recovers soon so she can come home.