You do know that the TA end up in Afghanistan as well, right? And that the harmony rules (amount of time spent on ops as opposed to back home) are broken more often for reserve personnel than regulars? I know one particular reserves unit where it is reasonably common to flip flop back and forth, and then get offered and accept a civilian job in Bastion...
Re the age - at 17, she would need your permission. At 18, no.
I know quite a few people who have gone to Welbeck. It is rather more steering you towards a commission though (understatement) Would she not tolerate a nursing degree? Or contacting the careers office and finding out about scholarships?
I wouldn't worry too much about the small town life thing. When I joined the RAF I had never been on a plane.
and I decided at 14 what I wanted to do, as well. I joined as a direct entrant (didn't get a degree first), but did go for a commission - she wouldn't be able to do that with nursing, obv, and I know they were talking about making a degree compulsory. If she chooses the right trade, she could always commission later if she has the aptitude etc. it's reasonably common.
I went back and got my degree as a mature student when I left. It is entirely possible to play around with the correct order of doing things and still tick all the boxes. It makes parents nervous, but ultimately, it is her life. She sounds as though she knows what she wants... (and yeah... She's going to spend years putting pissed up squaddies back together in the less salubrious parts of the uk, in much larger part than ops!)
The important thing is to get her to the careers office. And let her discuss options with the services and she can get a more realistic idea of the route she wants to take.
(I would actually have died if my parents wanted to come with me, by the way. I first went at 15 or 16, when I was finding out about bursaries. As far as I was concerned, this was me making decisions about my adult career, and Nowt to do with my parents. I took all the stuff home and talked it through there, but there was no way on this earth that I would have showed up for a potential job interview type scenario with my mum......
)