Ok so, I'm a 17yo guy who is completely new to PUA and pretty much talking to girls whatsoever, I've had exactly zero relationships in my life and my self-esteem is not really that great (although somewhat better after having this 20yo girl I met at the same party initiate chat with me on FB the day after telling me my face is 10/10 - although I was not really interested in her so that's another story).

This girl lives about 1hr away from me and this is the first time I met her.

Ok, so onto the actual story:
I was at this party at my friend's place this Friday and I met this HB10 (yes, I'd totally rate her a 10, she is truly the most beautiful girl I've seen in my life) which I was introduced to by my friend. We started talking and I'd say had a great time. I didn't know about PUA or anything related to it at this time so I had no idea how to attract her to me at that time, I didn't know about kino or the keeping eye contact at all times or anything like that, but either way, we talked. I didn't manage to pick up her last name or number or anything before she left, but luckily enough I knew her friend's full name so I looked her up on facebook and found HB10 through there. The day after the party I added HB10 on facebook and sent her a message something along the lines of "So I don't think I got to say goodbye yesterday but I really enjoyed meeting you, I had a great time" and she replied with "Oh you might be correct there. I had a great time too".

After this I didn't write a message until the next day again and I said Hi and asked how she was doing and we started talking from there for a while, the last message being when we both had to go eat.
After this she hasn't written anything to me (It's been about a day) and I'm afraid that if I initiate the conversation again maybe I will appear needy or something.

What should I do?
Should I wait until she initates chat and just don't bother at all if she doesn't, or should I write something to her, in which case, what should I open with?

The last thing she said was that she was going to her grandma to eat, maybe I could open with a joke such as "I thought you were going to your grandma to eat, not to be ate by her" (Red Riding Hood anyone?) or is that just lame?

Update:
Success! She initiated chat with me today and I let her wait a little before I read it and replied (so that it wouldn't look like I was sitting at my computer, not that I was, I actually saw it on my phone while hanging with my friends, but still).

needy it shows you expected her to write you back and have been waiting for her to do so

Not quite sure what you're trying to say. I understand everything except the first word since there's not really any context to it.

that was based on your little red riding hood comment the comment is funny, but it makes it sound like you have been waiting all that time for her to chat to you when she gets back

Ah, yeah I kinda thought so too so I decided not to go with that line

Soo....

I asked her out to cinemas and she replied with

"Aww how nice of you, but I'm really busy for a little longer than 2 weeks time, I'm sorry. Maybe another time".

That's it right? What she's trying to say is "I'm not into you that way" am I right?

Did you even get her phone number?

You needed to build more interest on her end before going out. Also fuck the cinema for a date. Think about it, have you EVER gone to the cinema for a time to get to know someone. I go to the cinema to

A) see an awesome film with friends.
B) see a shit film with mates.

Just go do something more fun with her. In a "get to know her" environment.

Anyway overall there is never a "game over" when it comes to gaming. Don't think so negatively. Just take everything she does as a test and RESPOND (don't react). For example:

Her: "Aww how nice of you, but I'm really busy for a little longer than 2 weeks time, I'm sorry. Maybe another time"

You: "It's cool, seeing it with a friend now. Don't worry. We'll meetup sometime, it'll be fun"

So either

A) She starts thinking "why isn't he bothered, the rest of the guys are, perhaps his life is better/more fun. I should have gone!"

B) She goes on with her life as do you.

Either way

IT DOES NOT MATTER, what a girl does is what a girl does. Don't let it get to you or effect you. Just boss it, find something else awesome to do and go do it. It can be anything, be creative, play games, read a book, exercise (that's a good one, the endorphins your body releases cheer you up, buff you up and attract females)

Yeah. You did not come off as her type. She probably would have said yes if you said a group of you should go out. If you are interested, that is your next best step. I would normally advise against it and let her bounce, but you are 17, who f*cking cares.

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Cheers for the tips guys Definitely did not think about the respond don't react thing.