If she doesn't have literally anything for you to talk about off of her profile, I'm not sure. Maybe ask what kinky type things she is into and work off of that. If she is shy about it maybe offer up a few ideas of your own. (start light, like blindfolding and feather ticklers or something, i wouldnt whip out anything super kinky that you are into anywhere near the beginning

)If the sex chat is putting her off maybe try pets or something really general that a lot of people have strong opinions about. Don't start an argument if you are on the opposite side of a strong topic, it's just to get her talking. If she's still responding I'd say not all hope is lost, if she stops however i'd quit wasting my time....
I am not sure how long you have been talking or anything, if she's local maybe try getting her to go out with you for lunch or something since the online conversation doesn't seem to be getting to far.