Who is Samantha from I, Tituba, Black Witch of Salem and what is their importance?

In the Epilogue, Tituba describes Samantha as the child "given" to her by the spirits of the afterworld because she (Tituba) never gave birth to a child of her own. Samantha, according to Tituba's description, is everything she would want a daughter to be - beautiful, smart, and independent, an embodiment of all the possibilities inherent not only in being born, but in being black and a woman.