Tell her in a sincere way that her lips look sooo pretty when they're closed. We women are vain creatures.

This.

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Jazzy Jeff: "My love for you is like a river,
Like a summer breeze that makes my soul shiver,
One look from you is more precious than gold,
Let's grab some BBQ and go get busy!"

Also girls talk shitloads more than men.

Does she have any friends? Normally she should exhaust most of her blathering on them.

^^ Archer your always short and to the point

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"J, I guess yer so amazing in bed you send the girls into a transcendent state where they realize their own mortality and are shaken by the realization that their presence bears little impact on the universe, or they just realized they hate you"
-DJ_Z

Only just managed to read this due to my laptop breaking. Most of your answers have made me laugh but the serious ones do make sense.

I can see how her talking would be seeking validation, although when she is going on and on I tend to just nod and smile, but pay wayy more attention on other things, that probably just makes her talk more, and, she definitely likes to fuck haha
Thanks man. I'm definitely going to do this! And thanks to everyone else who answered, too

There could be any one of a number of underlying causes, but it's impossible to know without a lot more to work with.

The fact that she seems to have some self-awareness on the issue suggests some kind of personality disorder, but that's just where a competent therapist would attempt an intervention--after ruling out a neuro-chemical imbalance.

Anyway, if you care enough about her or being with her to do an intervention, then do something like this:

"Look, name-of-girl, you talk way too much and I've brought this up on a number of occasions. You say you know it, but you are not making any efforts to change it. This is a problem for me. I feel I hardly ever get a chance to talk and when I do, you barely listen. And it's not just me, you treat everyone like this. You need help and I expect you to come up with a plan to make this better."

Note there is no "or else" statement here. It's (1) You are doing X, (2) I have a problem with this, (3) I expect you to work on changing it.

For me a girl (or anyone I have to spend much time with who isn't paying me a fuck-ton of money) who won't work on self-improvement in a area that dramatically lowers my quality of life is a deal-break, so if she says "no way," I would start withdrawing, give her less and less of your attention until she makes some positive change.

Note, this is how you deal with anyone who has a problem you care about, whether is drugs, or narcissism, or constant flaking--tell them what they do, tell them you are not okay with it, tell them to get help to change it.

What are some examples of things she could do:

1) read up on the topic, start on the internet, get a book or two, do some exercises,

2) see a psychologist or therapist,

3) see a psychiatrist (hey, some anti-ADD drugs might fix this)

Most of all, once you've done this, it's on her--there is literally nothing else you can do that won't just make you miserable.

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Cuts like a knife