Well, since you talked to her and got no where, its time to end things.
This issue will forever be relevant if you and your SO remain together.
The temporary fix of her "trying" to engage in sex will fix nothing.
The first time will be great cause its almost like a "finally" moment. But afterwards, you will feel guilty and unnatural. It will feel like you are forcing her into it as she has no interest. Plus most likely it will be very unsatisfactory.
Sorry bud, but I think its best if you end now before you get dragged through the mud.
I feel strongly about this after reading your comment to BaoTurbo.
Edit**
Not exactly the same problem as you still similar. some good points
http://www.reddit.com/r/relationship...d_i_leave_her/