Do NOT do this. This is super creepy. If I had a 12 year old daughter and I got a letter like this, I'd want to run for the hills.
They are asking for donations for training. And she's already a US junior champ. Based on her social media, she has a fan following already. But this was just a suggestion off the top of my head, not that I put much thought into it. I'm just completely sick of people saying that her technique is awful so she's going to lose her jumps. Instead of whining about it, why not just tell him instead? I find all this complaining grating.