My 83 year old mother
uses Hotmail. It's free. My dad used it before he died and she is continuing to use his address. Except there is a lot of ads taking up room on the screen. And it is a little too small for her to read if she prints it out. So sometimes I copy one to word and blow it up for her.
Good luck with her & computer. I hope you or someone lives close enough to pop over and help. I am the "support tech" person for my mom and some of my friends. Sometimes it's hard to figure out what they are explaining over the phone.