For the kind of money you are talking about, she needs to be professionally fit. Even without a bike, a good fit should be able to let her try diff. set-ups on one of those fit-cycles, etc., in order to figure out what is the best frame to order.

Terry makes bikes with proportionally shorter top tubes, but not in carbon which you seem to be looking for.

I think a sloping top tube design will help with the fact you may need to buy a smaller frame than her height demands to get the right TT length. But don't be fooled by steeper seat tube angles. Even though they make the TT appear shorter, they lengthen the reach since you need to slide the saddle back further on its rails to achieve the same KOP position.

Of the top of my head, why don't you look at the new Cervelo RS. I think the STAs are too steep on the orbeas for many women with long femurs.