I need to find a good voice activated phone for my 90 year old Mom. She is Blind and has non-functioning hands. Help!

My Mom is 90 years old. Just suffered a stroke on her right side. She is now wheelchair bound, blind and hands are paralyzed. She still lives at her apartment and my sister and I take turns staying with her. I travel 300 miles 1-2 times a month for 7-12 days each time. We need a voice activated phone that is reliable for her to make calls. I have already called the foundation for the Blind.....they just suggested books for the blind. Please, please help. I know there has to be something she can use.