Handstand 1 for my 9 Year Old Daughter

My daughter is 9 years old and will be moving up to level 4 after this summer. I bought the Handstand 1 course for her as her coaches say that the most important thing we can do this summer is to improve her handstand. How do I adapt the Handstand 1 course for her? How long do I draw the progressions out since she is young and her body is still growing? I do not want her to injure herself by overdoing the Handstand 1 course. Keep in mind she is training 12 hours a week in gymnastics as well as an additional 3 hours in a Parisi (sports performance) Gym. Thank you! Edmund