On another thread, there is a collector from Italy that used an exacto knife and made slits on the sides of her skirt and now the figure can render wide stances, including sitting on top of Battle Cat.
I don't see why 4H/Mattel can't do this on any future release of the figure. Also, it might look good if they just painted the upper leg behind the skirt to match, so the slits would not be that apparent. I'm sure there are a couple of ways they could correct that problem.
On some other thread and weeks ago, another org'er posted a computer rendering of She-Ra with a skirt that was "tiered", where the center of the skirt was lowest and with each wave of the fabric it got a little shorter, leaving room to create the "wide stance" because of the lack of coverage on the sides of her legs. That was just a rendering, though. To my knowledge, no one has actually cut a skirt like that and tested it.