Any help would be great.

Well since from time to time I'm fairly good at this I'll help:
Say really weird stuff with uninterested facial expression.
Make strange body movements, such as turning around, figeting and other unappealing things.
Be negative on about anything she says. When she talks about what she does for a living say "Omg that's boring."
etc etc.

In general, just don't have a good time. It's really easy.

I have also had to deal with this at times.

See how attraction(DHV, strengths, fun time) works, do the entire opposite
Call out on your weakness, purposely show low value traits, nullify your good traits, and in all have a gloomy time.

Just hit on her friends....it usually always does the trick. If you are from a specific community and you don't want to look like an ass, i suggest you be straight up, tell her you are not interested.

Trying to get someone to NOT be attracted to you is very odd. Especially in the PUA world. it's a contradiction...I suggest never "trying" this. if a woman is annoying you, tell her.

I don't however recommend being an "ass" she may have some hot friends, or be connected to people that you may need in your future. Negative is negative, try to keep your energy always positive.

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Seduce their mind and the rest will follow.

Alright, sound advice from all of you. Thank you for the replies. The thing is I've told her about a year ago I wasn't interested, then few months ago had sex with her when I was drunk, then told her I wasn't interested, and now she's trying to get me to be her bf gf all over again. I've just told her I'm not interested, no reply. We'll see what happens.

simple be blunt i know its an unoriginal concept but tell her the truth

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life sucks and then you die! deal with it

Call her fat.