1 month? 2? 6 months?
Yes. It depends on how often she is willing to stand in the house and throw a balled up sock against a wall. But, you and she need to start from the ground up. I would love to start her from lesson #1 and then, during that lesson, let her incorporate things that she knows, also.
Give her a finish, such as leap and drag the back foot up to the front. Keep everything on the power line. The hands actually coordinate with the feet. At release of the ball, I would be showing her that her right shoulder should be lower than the left, just like batting. I say "Release and relax," a lot.