I just started a photography course 5 weeks ago at my local college; it is worth 3 A levels when i finish the 2 year course, and i can go on to university from it too. I would highly recommend that she waits until the local college starts enrolling in July and applies for a college course. I am on a course called 'BTEC Extended Diploma in Photography, Level 3' and its fantastic, i am enjoying it so much; in fact today i developed my very first film and it was so amazing. It's probably not for everyone, but if she wants to learn all about photography; both film and digital, then she cannot go wrong.
She might not want to wait a year, or might feel a little worried going to college at a later age; but i am 19 and i will be 20 in a month, and even though i am not the 'average' age to be starting a course, i have many friends and i feel great about the course and the college.
Other than the various 1-2 year courses, the colleges do sometimes offer what they call '19+' courses, these are beginner courses to get people started in something, and you get a certificate at the end of the course which can help you to get into work.
I hope i have helped you,
Steve