That's pretty bad to have to wait one year for a test. I had mine in Brisbane with less than a month wait! Most doctors up here seem to have at least heard of it, two doctors I've seen so far are actually quite knowledgeable about it. One doctor who was quite young, so I think she'd recently graduated, had never heard of it - this makes me think they still aren't teaching new doctors about it and that it's only doctors experienced in chronic disease management that educate themselves about these types of problems.
She might not be able to be officially diagnosed, but explain the poor man's test and if that's positive, then she can start implementing some lifestyle strategies at least (water, salt, compression stockings etc). I'd already decided I had POTS before my diagnosis, although I didn't start to change things till after my test so it would reveal the extent of my symptoms. If she has to wait a year though, she'll probably want to try some lifestyle changes to help her survive that long without treatment.