Why Our Lady appeared on 13 day of the month at Fatima

According to Catholic Daily, at:

http://www.catholicdaily.com/forum/viewtopic.php?f=10&t=606
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Why Our Lady appeared on 13 day of the month at Fatima

Was it because She wanted to free us from the superstitious thinking about thirteen as a day of “bad luck”? We know the reason may be deeper – biblical reference to great woman - Princes Esther, who is considered by biblical scholars as a figure of Our Lady Mary. This great woman saved Jewish people from extinction on that mysterious day - 13 day of the month. interceding for them before the king asking Jewish people for prayer and fasting: And the king's scribes were called in the first month Nisan, on the thirteenth day of the same month […]and the letters, sealed with his ring, were sent by the king's messengers to all provinces, to kill and destroy all the Jews, both young and old, little children, and women, in one day, that is, on the thirteenth of the twelfth month, which is called Adar, and to make a spoil of their goods. And again Esther sent to Mardochai in these words: Go, and gather together all the Jews whom thou shalt find in Susan, and pray ye for me. Neither eat nor drink for three days and three nights Queen Esther also, fearing the danger that was at hand, had recourse to the Lord. And when she had laid away her royal apparel, she put on garments suitable for weeping and mourning And the king gave orders to them, to speak to the Jews in every city, and to command them to gather themselves together, and to stand for their lives. And one day of revenge was appointed through all the provinces, to wit, the thirteenth of the twelfth month Adar. So on the thirteenth day of the twelfth month, which as we have said above is called Adar, when all the Jews were designed to be massacred, and their enemies were greedy after their blood, the case being altered, the Jews began to have the upper hand, and to revenge themselves of their adversaries. (The Book of Esther) Esther means star. Our Lady at Fatima had a little star on the bottom of her mantle…