I weigh a little more than you and ride a 151. No need for a girls board IMO. I've rode a 153 no problem but it was a little stiff. Your weight is right in the middle of the NS SL 151 weight chart.
Never Summer Snowboard Size Chart - 2011 | evo
It's not that soft, so if you want more flex, maybe an EVO instead. Size 10 boots won't do so well on women boards, I don't think.