You say your daughter is 13 , and you are worried about how she will treat you when she is 18 ?
I think you are being paranoid , my bet is , long before she reaches 18 she will see the bullshit of the JW religion.
However , in between time you just need to show her how much you love her , and the fact that you and your missus have split up has nothing to do with her , it is in no way any fault of hers and that both of you love her , and want her to succeed in what she wants to do with her life and encourage her with her goals.
In the meantime
But also try to get her to think for herself , reason , and do personal research , and not just accept what anybody says , including you .
Try to get her to research things that may have a great impact on the rest of her life , and not just accept other peoples viewpoints .
You have a 5 year project ahead of you buddy , and I have faith in you that you will have a happy outcome .
Take care , and I wish you both well.
smiddy