i guess the raaz is that guari kundali says that gauri will die in young age.. so tat y shiv is agree to marry her.. because his kundli said whoever he will marry will dies also... so wut u guys think..
if her kundali has a problem then it is her parents who will come to know it first, right? may be her jathaka will reduce or balance with that of shiv's and will block the bad things happen in shiv's life... always the kundali dosh is for a period of time... that is what they weer saying it for an year or two and half year etc...