So last friday night I met this girl, and she ended up hanging out with me and my two mates all of Saturday. I used to be pretty into the PUA stuff last year until I got a girlfriend for most of a year.
I'm a funny, good looking guy with a pretty reasonable amount of game, and this girl is the first HB12 I've ever met, but despite having countless guys on facebook tell her how pretty she is and having heaps of friends, she is surprisingly shy, reserved and hard to work with conversationally.

I've been seeing her more since then, and we spent this entire weekend together, but she still seems like she feels uncomfortable or nervous around us. This is one of the best opportunities to come my way and I don't wanna screw it up!

Cheers, any help would be great for a newb like me

Find a way to get her one on one. As far as I understand from your post you've been hanging out with her and a couple of other friends at the same time. This will make things to safe. It's basically a highway to the LJBF-zone.

Invite her out to do something. It doesn't have to be more than a coffee, but this will show your intentions. Once you get her alone, you press "Play" and start gaming.

" she is surprisingly shy, reserved and hard to work with conversationally. "

Even the most reserved and shy girls have a button you can push to make them start talking. What this button is, is different from girl to girl, but very often it's what they burn for.

A girl I was talking to came off as a cold bitch at first, but what I realized was that she was hiding behind being a bitch, because she was actually really shy. She used the whole "I'm too good for everyone" as an excuse. Now, I had no real interest in this girl, but I saw an opportunity to improve my game. At first, the conversation went pretty bad, until I later discovered that she just had returned from a vacation in th US. Once I got her talking about that, she wouldn't stop, and when she was done talking about her trip, she was all of a sudden talking about everything between the earth and sky. Point of the story is, brake her "shy barrier" and conversations will go smoothly.

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Alea iacta est - The die has been cast

Yeah that helps a lot, thanks. I just saw her this morning, would it be a good idea to ask her out for coffee tomorrow, or should I give it a few days?

Don't overthink it, just do it naturally. How often do you speak to her by texts/chat? Do you speak to her daily? If so, just bring it up while talking to her - "Hey, me and xxx went to xx place it was really nice! Ever been there?" If she says no, well you've gotten yourself a date.

As to planning when the coffee should be, that kinda requires some information on how often the two of you see eachother etc. so I'm not going to dig to far in to that.

Just make it as casual as possible, if you set the date tomorrow, or in a week, depends on how often the two of you see eachother on a regular basis. i.e. if you say "Well I'm busy until Saturday, so lets say Saturday at 2pm." And you meet her with your friends 3 times before Saturday, that's no good! Ask her "So, how does your week look?" Find a day that fits both, and set up the date.

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Alea iacta est - The die has been cast

Well as I said, I met her last Friday and saw her until saturday night, then we met up again this friday and hung out as a group for the entire weekend until this morning. So it would kind of be like our first date as we haven't had much one on one time.

Also studying the way I was with her this weekend I realised that we had virtually no kino escalation or much physical contact at all which I'm extremely disappointed about for not taking advantage of such a great opportunity.

That's why I thought if I could have a quick date with her in the morning before I meet my friends I could start to build a little kino so she's left with that impression until the next time we meet. What do you think?

In that case, you should give it some time before you set up a date.

First, wait a couple of days, see if she initiates contact. If not, talk to her (would atleast wait until Thursday) and set up the date a couple of days ahead. You want to seem like a relativley busy person, and by dedicating all of your immediate future to her, you won't.

Yes, I know she's shy, and it's not very likely that she will initiate contact. Still, you should atleast wait a couple of days before texting her.

As far as the kino goes, it may allready be too late since you've probably not come across as a "touching person". So you should escalate this immediatley when you meet her next, so it won't be awkward later on.

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Alea iacta est - The die has been cast

Yeah great advice, thanks for helping to clear that up heaps. I'd better try to move quick, can't exactly see a girl like that staying on the market for too long