There was a girl I must have added from a dating website and was just chatting to her and she had a bit of a bitch shield I would sort of break down and dominate the frame but it did not work and I do not know why, I did not act like a wuss and did not answer her questions.

Me: Howdy hows it going?

She blanks me, after 5 minutes I reply with:

Me: I guess you think you are pretty hot don't you lol
Her: sorry?

I blank her

Her: excuse me who are you?
Me: Your next boyfriend if you weren't pretending to be so high and mighty all the time lol
Her: high and mighty? how am i doing that
Me: you know how, we must have met on netlog or bebo perhaps
Her: can u explain to me how im doing that?
Me: why are you so concerned you seem like the type who is used to getting their own way lol but not this time :p
Her: im not concerned, ur just trying to be mysterious, when acutaly ur just being a little bit weird
Me: if you say so lol at least I have a sense of humour
Her: yes ur right i am boring
Me: I bet you are a nice person when you are not pretending to be stuck up though :p

Then she blocks me and does not reply

Did I go wrong here or neg too hard this girl is like a 7 or about average in looks.

What do you guys reckon, any way this could be improved, I tried to make it a bit playful whilst challenging her to open up a bit?

First of all dont you ever never say lol ! If you want to be playful say ,,hehe" or ,,haha" and throw in smilies that are fun and playful like (: , ;d , ;D or ;/ when suitable.
You also went a bit over the line with negging imo.

howdy hows it going seems pretty generic, she just seems really dumb. Maybe you should've picked a topic she interested in a say you could do it better. You negged her like in each of your replys lol.

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Negging is rarely needed online and you went overboard. BIG TIME.

This seemed more like insults...