She definitely does carry it, as did Bria quite often, and it's definitely not enforced except on very rare occasions. Of course, Jordan (yes that one) carried it with regularity so Mo is in good company !
For the most part it's part of the modem game now on both men's and women's sides of the sport although oddly enough (considering their hands are much much bigger and the ball is only slightly bigger), the guys are much 'worse,' in that a greater % of them carry the ball pretty egregiously.
Random thought: one of the worst offenders in my memory was Kenny Anderson of GA Tech and then the Nets, IIRC.