What Causes Brown Vaginal Discharge And Hot Flashes?

my daughter was having some brown discharge then she got very light blood thinking that was her period she never starts her period with brown discharger usually she has it after her period and has a heavy flow and now she has hot flashes with some a little bit of light headed i dont kno if she it something we need to be concerd or should i take her to the dr and get her a hpt