You have free will to discern what God wants for you, or you can reject it entirely. You can marry the wrong person, that’s anybody’s choice. Me, I chose to pray for discernment and to have the wisdom to recognize the one God wanted for my husband, for surely God knows better than I. Perhaps if more people took the time to discern God’s will and pray for their marriage partner instead of thinking they know better, there wouldn’t be as many bad marriages and divorces.
And since you brought up free will, aren’t you basically asking to take this girl’s free will away from her if you pray for her to fall in love with you? Wouldn’t you rather know that she wants you because she has prayed for a marriage partner and discerned God’s will for her life and then she falls in love with you?