Does the father's refusal to complete the marriage of the religious and well-mannered girl after the engagement constitute a stigma upon her?

If the girl is religious and of good character, try to convince your father to agree to the marriage, even by seeking help from righteous people. If he refuses, it is better not to disobey him, even if the engagement has taken place, because it is narrated that Abdullah ibn Umar divorced his wife by order of the Prophet (peace be upon him) when he learned that it was Umar's wish.