Bonovox40,

.......The thing is that I currently will not be able to travel with her UNLESS the trooper training gets pushed back further.

I assume she did not see much of the US from the camp, so you'll be able to show her the country even without much travel - locally - so to speak.
I guess you may invite her on her holidays from her school - to come to visit you.

....I'm not sure what the legal ramifications of her visa are.

Assume there some. You have to initiate some paper work for her and send an invitation papers. In any case you have to start that early if you want to succeed.

..........Whatever happens on either end, it looks like the best case scenario is a long distance relationship of a minimum of 2 years.

2 years? Then forget about it, man.
Either you gonna meet her soon or never.
One way to use her school holiday time.

.....She can't leave to just come see me, and I can't leave because of my career for some time.

You do not have to leave at all. And she'll be definitely able to accept your invitation.