[Opal]

The short answer is you can't.

You can suggest it to her, write her letters, call her, visit her, but you can not make her do anything.

If you are really convinced that you want to do this, there are books on the science of persuasion that may help you. Search persuasion in your local library catalogue and see what comes up. You may be able to tempt her or point out the benefits, but she may not want to regardless of what you do.

Ultimately it's her life and she is responsible for it. She gets to make all of her choices and no one else can choose for her.