I believe you are on the right track. If the polished Nemesis is too much, I onestly think I would lean to a strongish, highly polished pearl ball with strong backend characteristics.
I got my wife a Hammer BURN, and she loves it. If there is decent head oil, the ball stays very clean (even with her slower speed), but really reads the dry backends well and finishes strongly. She doesn't like to play a big swing, and this ball allows her to stay inside the oil line and still get enough backend to carry, and it is only a 12lb ball.
On a side note though, the cover seems to dull pretty quick and it picks up every dust/dirt particle it touches. After a 3 game set, it gets cleaned and needs it.
"Yeah, I throw AMF. What's it to ya"?