I'm sorry to hear about your situation. Can you tell me: is your ex worth suing? Does she have money or assets that you know of? Are you still intending to see your daughter, I presume you still treat her as your daughter?
If your ex has no assets it's not worth suing her as even if you prove she deceived you and the court awards you compensation she'll never be able to pay it. There would be no purpose in you paying to sue someone has no money. I think you have to put this behind you, hard as it is, and continue to love and support you daughter. Happy to discuss. I hope that helps. Please leave a positive rating so that I am credited for my time.