Supersnake, I was only giving my reasons for believing she will be fine. Everything has exceptions. For what it is worth, I have experience over the years of evaluating vocalists and predicting with a degree of accuracy how people will sound with training , how ready they are to perform in high pressure situations, and how likely/when they are to have success, and not just as a hobby.
You could be right. She might crumble, and her voice might not hold up under pressure. I have seen maybe 2 instances of this from someone with her vocal ability, experience and maturity over the years, and that's why I think she will not.