In this case if you will try to explain your daughter that her mother is brainwashing her mind by saying against me then she can consider you bad, just as her mother want. She will admit what her mother says about her dad is all true and he is same and matches with her mother thoughts. In this it would be better if you keep clam and treat her polietly beacuse one wrong step of yours can help her to prove her mom right. Behave normally and talk to her about the general topics, this can help you to build more strong relation with her. She will trust you more, pamper her in the best way you can, she will slowly understand that her dad is good and can start beliveing that what all her mom said was not true.