From MLB dot com:

Here’s sportsmanship, defined: At an NCAA softball game last weekend, Kara Oberer of Eckerd College knocked a three-run homer. But she couldn’t make it past first base, having suffered a knee injury earlier in the day. Pitcher Chelsea Oglevie of Florida Southern College, who had just given up the home run, and Leah Pemberton, the second baseman, carried Oberer all the way home:

Apparently, if someone on her own team had touched the base runner, she would have been out.  But there is no rule regarding members of the opposing team helping her around the bases.

“God I love baseball.”  Roy Hobbs | The Natural