why wait till end?

i do not understand why riddhima says yes to marriage and waits till end to drink poison. marna hi tha to kabhi bhi mar sakthi hai itna kharcha aur sab ko pareshaan kartne ki kya need hai?shadi ka kharcha , mehndi, sab kuch 2 days me sabse tayari karvani,dulhan ki tarah sajna whats need yaar ? shadi ke liye ha kehne se pehle hi poison pi leti sab ko itni bekar ki mehnat to na hoti