i agree with the "high road". when any of us have a real need, we turn to the ones we love and trust the most. your daughter knows she can trust you to help her do her best. she trusts in your love for her to overcome any feelings you may have about the marriage. she loves her dad--she can't help that. and no matter what may have happened between him and you, she is still the result of a love that existed at one time. she believes in that, and she believes in you.
you won't regret supporting her in her endeavor to do something good, and she will find her trust and love well placed.