I'm not sure, but is this girl interested in me

Is this girl into me or are we just friends?
There's this girl that I like, really like, we're friends, but I am not sure if she's into me, as I cannot tell if she's flirting with me or not.
First off, we talk loads, and I mean loads, when we talk we smile at each other and throughout the conversation we look into each others eyes, neither of us look away, when I finish talking she'll ask me a question or tell me something interesting, when we first started talking she was always looking down, talking really quick and stuttering on some words, now it's not so much. I s this a good or a bad sign? (I think it's good as it shows she's more comfortable around me)
We both like almost all the same stuff, music games etc.
I've made her laugh once or twice, and she's only laughed at me when I've made a complete and utter fool of myself.
In addition, if I need anything, like a pen or a pencil or some help, she'll always help with anything I need.
Finally when I asked for her number, she said yes and blurted it out at me.
I'm very shy, and she's only just come out of a relationship.
When I send her messages she usually replies, however sometimes she doesn't, (she doesn't reply when I ask her how her holiday has been going) is this good or bad?
Should I get to know her more after the holidays?
I would really appreciate any help on this as it is urgent to me
(I don't wan't to be just friends)

from your description, it sounds like this girl does like you. if shes shy and shes becoming more comfortable with you, that is definitely a good thing. if it were me, i'd take things slow, and when you're ready, ask her out on a date and tell her how you feel. just be honest, im sure things will work out. good luck!