What is required of me after I vowed to God what is in my womb, intending for Him to protect and shield her from people and make her among the righteous, thinking that this was the meaning of a vow?

This statement is idle talk and does not obligate the speaker to anything. A person's vow of their child is not legislated in our religion. Therefore, nothing is incumbent upon one who vows their child, because it is a vow of something one does not possess.