Explain to her (in small simple words please) that as a man you know what is best for women, including her. That it's just a silly phase she is in and that you will be better for her than any mere woman could ever be. Reiterate often that you are a MAN and that you demand she date you.
If she refuses remind her that all you have to do is talk to her father and he will hand her right over to you. This is the best way to approach any woman you desire to date. Show her your alphaness and refuse to be a fool.

(Hate that I have to do this, as I think the /s should be quite clear here, but I've been wrong about how others perceive sarcasm before)