We cannot help the mistakes we made before converting to the Faith. God always works around our sins; He really has no choice. He still permits us to choose; we are not on strings. He does not force our liberty, but continues to pursue us, as we know it through situations and such. Being a father is a vocation, just in a different way according to circuмstance. Perhaps God will provide a wife in the future who will help teach and raise your daughter. I have come across spouses that had children out of wedlock and soon married another, if not the one they had the child with.
Your daughter is fortunate to have a traditional Catholic father, and so of course give her your loving guidance, since He gave you this child to your care. Best wishes