Did I lose her, if so can I get her back?

Last year I had a crush on one of my friends and I asked her to prom "as friends", uming she wouldn't want a relationship with me. She rejected me and she went alone. This year, she offered to go to prom with me and I accepted. She never said "as friends" but never said otherwise... When she asked, she sounded kind of flirtatious and giggled more than normal and talked in shorter, choppier sentences. She has been acting like she wants me to do the planning for the night even though this is my first prom and she is the "expert" (she's been to several in the past). I have been fairly indecisive regarding the planning so far (ie. I've asked for her opinion a lot and haven't made many concrete decisions myself) partly because I have no idea what I'm doing and also because I'm in the midst of deciding where to go to college (I'm a HS senior). After looking at all the places I've been accepted I've learned how to see the good and bad side of everything so I'm indecisive about everything... Recently she's been somewhat secluded and doesn't talk with me as much and the communications are generally very short and she doesn't seem quite as flirtatious as in the past. Did I "lose her"? She's a freshman in college and she went through the decision process last year, so if I've "lost her", do you think she'd understand and "come back"?