Asked her out she said no but I don't believe her?

Two days ago:



Me: Hey, did you see the movie Adjustment bureau?

Her: No

Me: Can I take you out to the movie this Friday then?

Her: This friday? No

Me: Oh ok *walks away*

Her: Wait was that a serious question?

Me: Yeah, I know I joke around with you a lot but yes. *walk away*



I always joke around with her all the time. I've asked her to Mcdonalds with dollar menu coupons SEVERAL times as a joke and she understands this. But she asked the question, "Wait was that a serious question?" and that threw me off.



ABOUT HER

She's quiet and hardly talks but she's talked to me a bit because I make fun of her. We laugh a lot together and make fun of each other, I feel really comfortable with her. She has that personality I like: not too obsessed with looks, no makeup, knows how to talk and make jokes, etc.



So it's been 2 days and we've been talking normally. Yesterday we talked about her SAT this saturday no awkward anything between us. I got a cookie from my friend and she stole the cookie from my hand today and joked with me she was saving me from obesity. She then took asked my friend for a second cookie and I was just joking the whole time about how I was starving and she was rubbing it in on how good it tasted and then she gave me the last half. She's so cute!



Today I walk in and since her SAT is tomorrow I make fun of her saying "ooh no SAT tomorrow no stress feels good!" but I think I went too far because she said sometimes she wants to punch me. I then we t to the board and she stole a bite of my food. She also asked me to check her practice essay and she was sort of laughing at my serious attitude and I was like "what's so funny! You can't take me seriously? She then quickly stopped laughing and I gave her pointers.



Should I ask again? I don't want to feel like I'm bothering her. Also how do I know she's interested if she hasn't mentioned it for 3 days now? It took every nerve in me to ask her out the first time.Asked her out she said no but I don't believe her?
just ask her again(:

and make sure she knows your completely serious