You would have to go to Court to get permission to take her out of the country. She will have some input although the Court does not have to respect her wishes.
You know you need his permission. You know you can't get it. The only recourse you have is the Courts.
At 18 she is emancipated and can go or stay, her choice.
The Courts are not going to take a child who has frequent contact with her father out of his life. It is possible to get an arrangement where he sees her less frequently but from larger blocks of time - and then the question is who will pay the airfare back and forth.
I don't see you being awarded any type of custody that will allow you to go and take her away from her father.
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