I'm gonna see this girl that I've been into lately and has been into me, and I was wondering what kind of negs would work on a shy girl. She kind of enjoys that kind of banter, and I know that negs are mainly just to get rid of the "bitch shield", but what are some that you can think of?

Negs are really best used all through out the interaction. Start paying attention to when YOU are getting negged and neg back. Every IOI you receive, you should give one back. Every IOI you give should be followed with an IOD/Neg. Every IOD you get, follow with a neg. Just be playful with whatever it is you are saying. Make fun of her. Tease her like she is a fourth grader. Think about the kid who had all the girls drooling over him in 4th grade and treat her like that. (FYI... I would advise against throwing woodchips at her)

Majikal is pretty much right, I really only purposely use negs when I need to qualify my self to a girl, to knock her down a peg or 2 so to speak. If she already likes you, ie attraction is established, you dont need to do it. Concentrate on establishing an emotional attraction.

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Girls do not exhibit shyness when they are interacting with guys they perceive to be of lower value than themselves so it's not a bitchshield it's genuine lack of confidence. Negging her is the absolute last thing you should do.

Indeed
I have a friend who is doing exactly this to a shy girl he recently started dating. It kills me to know that I could steal that hot piece of ass so easily any second - and I fear some other PUA will probably just do that.

Why shouldn´t you treat her like described above? Firstly, she isn´t a 4th-grader, she will probably enjoy your conversation more if you joke about stuff that isn´t at either of you twos expense. Secondly, it is a really reactive way to think "If she negs me, I´ll neg her back" or if "she compliments me, then I´ll compliment back". That Is how I would advice a girl to treat a guy she likes. Instead of making fun of her, try getting her to open up, investing in you by sharing her secrets and having a good time by laughing at stuff that is mutual funny for you two. This way you´ll be seducing her like the lady she is, as opposed to the 4th-grader she used to be.

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I would agree, but the fact is (in the words of David D,) Attraction isn't logical. It is so much stronger to use Push-pull than try to have a fun conversation and risk getting friendzoned. So much stronger to be a bad-boy that won't take any of her shit. Shy girls are INCREDIBLY receptive to this, to bad boys, it should be illegal. When a girl has low self-esteem, she'll do anything for the guy that likes her one minute but will drop her if she messes up or does something he dislikes. It's like a dream to have such a high value guy in her eyes.* It's a tragic truth.

*Note: to some degree, all people are insecure. Which is why Push and pull is so damn effective.

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Thank you for your advices TheMajikalMethod.