Hopefully you haven't given up on a response. First of all, I really would not hold my breath that she really kept it this long. What could you do to get even if she had thrown it away.
If you had children by this woman, have children now by someone else & she has children by someone else, appeal to her for the sake of the children. After all they deserve pictures of their parents.
If there was any family member who seemed to connect to her from your family or someone you connected with from her family or mutual friends might intercede.
Otherwise, just try to get copies of the pictures that family & friends have.
Exes can be very vindictive & do anything & everything to hurt their ex.