A vow of celibacy by a three year old girl?
Color me skeptical.
Your real problem is that Jewish culture and Law did not glorify celibacy in the way later Christian and Catholic culture did. It promoted marriage, childbirth and family. Virginity, particularly perpetual virginity, was not viewed as a good thing.
Well, Jesus (Mat 19:12) and St. Paul valued it (1 Cor. 7:1-7).
Regardless, there were the Essenes.
It is a lot more complicated than that. If not celibacy, chastity was an extremely complicated thing in Judaism, more so than in Christianity.
http://www.jewishencyclopedia.com/articles/4263-chastity