Swerv,
get her to a doctor, it doesn't sound right, there is a medical problem there but I highly doubt it is menopause at 16 years of age. I guess it's possible but you would think it would be more likely to be related to some other kind of medical problem rather than menopause. Maybe her hormones are unbalanced ? Might be worth getting her blood pressure checked to, high blood pressure can be life threatening, I have rushed my mum to the hospital on numeous occasions because we just can't seem to get her blood pressure corrected with medication at the moment, and she gets terrible hot flushes.
Regards,
.::suzy::.