I have no professional advice, but can only say hang on and stick to it, and spend the intervening time either doing something constructive, or just earning a bit of money. I'm sure she is suitable, but I think I might baulk a bit at a 19 year old turning up to an emergency. I'd assume that paramedic is once of those jobs you can turn to at any age, and that the more life experience you have, the better.
My godmother's grandson is apparently going to Uni in Bristol to train/study for paramedic, was that an option she looked at?