Is "Maybe a rain check" a good sign? OK need some advice on this girl.

Ok this girl in my class we have been talking and texting. Today I decided to sit next to her. Her friend was sitting on the other side of her and they were talking. She wouldn't even look at me, but started texting me. She said she is going to leave class early because she was tired. So I asked her if she wanted me to walk her to her car, and she said yes.

So about 5 minuets before she left. Her friend and her boyfriend got up and left. Then later I walked her to her car, and asked her out to a movie and my friends are going to see Friday. She said she had plans but said "maybe a raincheck" I gave her a hug and she left. SO my questions are, forgive me I got a few...

1. why wouldn't she look or talk to me in class?

2. did she have her friends early so she could walk alone with me.

3. Is "Maybe a rain check" a good sign?

4. She is also kind of slow to text me,and asks me for quarters and stuff sometimes.. Mean anything?

5. Is it OK to text her and ask her out since I already did in person? She is always with her friends.

6. I carried her book for her to her car. Smooth or stupid move?

Thanks!
Is "Maybe a rain check" a good sign? OK need some advice on this girl.
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