Just my two cents, our daughter also wanted to attend a writing camp at a similar age and we received valuable feedback from our school counselor: he felt that by waiting until she was a bit older it would be easier to accept the feedback on her own writing and she would also be able to provide feedback to others. Big difference between a 14 year old and a 17 year old. It could be a bit of a disadvantage to be one of the youngest and there are other things to do locally around writing in our area - for example local day camps that mapped to her age and also volunteering at creative writing camps for young children.
She did those things, successfully applied to several away writing camps for the summer of jr year not knowing covid would cancel all/move others online.
She is now in college majoring in English and continues to have a passion for writing.