I am not sure how unhappy she is about her height and how you feel about it but sometimes there are medical treatments that can help. Not recommending this as a course of action but it may be worth at least considering.
My oldest son is on a campus with kids from grade 5 - 12. When we started there last year, I was shocked at the variety of sizes in the kids. Boys smaller than my year 2 and boys much bigger than me (in height and weight). There is a boy a year up from him who clearly has a medical condition impacting is size. He is a popular boy, and on the basketball team, despite being very small with not growth in sight. I can think of another boy who is 2 years ahead in school from my oldest and he has been accelerated, my guess would be small kid even if he wasn't. Her size isn't her destiny :-)
