How can I teach my daughter to jump?

My Daughter is currently playing netball two times a week and training once plus some work at school in other sports,she is twelve years of age but is taller than some of the other girls but they are now catching up but my daughter does not know how to jump because she has been taller.How can I get her to change this through a training routine?She is a good player and I suspect she could be a lot better if she improved her fitness but I am loath to push her developing body.Any suggestions please?