What is the expiation for a vow of daily lifelong charity made by a seventeen-year-old girl to protect her family, given that she has not learned the affairs of the religion of Islam but reads the Quran and believes in the existence of God?

Whoever vows obedience to Allah must fulfill the vow. If one is unable to fulfill it or finds it difficult, then an expiation for a broken oath (kaffarat yameen) suffices. The expiation for a broken oath is feeding ten poor people, or clothing them, or fasting three days for whoever cannot afford that.