If she loses her ability to speak there are many ways to help her out, but nothing can replace the sound of her voice, especially for those important moments.

Just in case. Record specific messages for various people in her life, that can be used repeatedly, Children, Mom, Dad, siblings, in-laws, friends, messages like: "X, I love you", "X, I miss you.", "Mommy loves you!" "Give me a hug". "Holiday Greeting", "Happy Birthday","I'm so proud of you!" favorite happy saying, frustration saying,

You get the idea.