ANSWER:

This duaa is only said when she has become a widow! It is said at times of calamity and not to get married! 

QUESTION: إِنَّا لِلَّهِ وَإِنَّا إِلَيْهِ رَاجِعُونَ ، اللَّهُمَّ أْجُرْنِي فِي مُصِيبَتِي ، وَأَخْلِفْ لِي خَيْرًا مِنْهَا Can women recite this dua in sujood or before salam, in order to get married? Some scholar suggests this dua for marriage.