OH my gosh, Sophie. I got tears in my eyes reading this. I cannot imagine going through that. How scary!
But I agree, you did the right thing. Unless you feel like you, along with one of your parents, could go follow up on the letter, you might just have to realize they won't pay what you requested. It would be great if they did, but you never know. I also hope it doesn't cause uncomfortableness (Is that even a word? LOL) between you now.

Poor Giselle, I hope she is feeling better soon!! Give her hugs and kisses for me please.