A Dominion War orphan of a Cardassian officer and his Bajoran mate. Both parents killed at the end of the war. Raised by a starfleet family who adopted her from Cardassia Prime during its rebuilding.
Raised during the rebuilding by a Bajoran missionary helping to rebuild Cardassia and a Cardassian woman who fell in love. They told her stories of the war and the occupation and the federation's involvement. She grew up to enter starfleet and become a medic like her Mother.
I'm not saying that it couldn't happen...what I'm saying is the overall attitude of the people who had been raised to hate the other wouldn't just change overnight.
Garrack and Damar are exceptions to the rule. They fought next to Kira, trained with Kira, Slept, Ate, Hid, and faced the same dangers as she did...Those close to the situation would have been accepting following the war. Yet how long would it take them to change the overall attitude of the people in general??