Hello Tinkerbell,
I was diagnosed with NCS as an adult after many episodes of passing out and being rushed to the hospital, only to be released by doctors who couldn't figure out why I blacked out. Your daughter sounds a bit more serious than my case, but anyhow....I thought I'd tell you what one doctor told me...in fact he was the first doctor to diagnose me properly . He mentioned that NCS usually happens in preadolescence years and often patients grow out of the condition, or it gets better as they grow older. Its been sort of the opposite with me, having fainting and dissiness followed by intense headache, and malaise as an adult. He asked me if I was very active in youth, and I said yes. You see I was very athletic, (exercise raises your blood pressure), always wearing shorts year round because I had great circulation...was never cold. Thus I wasnt having fainting spells because I had good blood pressure then. I'm less active as an adult...(trying to fix that), and stress and caffeine is a trigger for me.
My point here is to offer some lifestyle changes that may help your daughters condition. Finding activities that naturally raise her blood pressure like...dance, jogging, anything cardio....and simultaneously, she will likely intake more fluids (water) after exercising. Regular exercise also lowers stress levels(which also can bring on NCS spells).
I am a credentialed educator, and I've done a lot of reading on the subject...As far as I can see, all in all exercise and drinking more water, avoiding caffine, and stress, all help to elleviate and possibly eliminate NCS. Ok sorry, I sound like I'm rambling now. Your daughters young, and has to look at the long range picture... tell her she only has one body, and isn't it worth it to take care of it now. Adopting some routine habits may make NCS go away all together in her adulthood. Hope this helps.

i was just diagnosed with vasovagal or ncs but i think it was caused by me running too much soo i stopped and ive been taking salt pills and drinking loaded water but i get that feeling up to 5 times a day. I get sweaty and feels like i need to use the bathroom and my legs go week then i have about 30 minutes to lay down and sleep or i faint. Do you guys know anything that could help me im only 16.