George Vescey of the New York Times (after Graham Hays of ESPN.com ran the story) picked up on the story of Sara Tucholsky, a softball player for Western Oregon, who hit a 3-run homer against Central Washington last Saturday. Tucholsky tripped going over first base and hurt her knee, which left her unable to complete the circuit of the bases.
The umpires at the game ruled that Western Oregon couldn't put in a pinch runner for Tucholsky and that the runners on base could score, but Tucholsky would only be credited with a single. Two Central Washington players, Liz Wallace and Mallory Holtman, offered to carry Tucholsky around the bases so she could be credited with her home run. And they did.
The efforts by the Central Washington players are certainly worthy of praise, but ultimately, the umpires messed up the call. According to the copy of the 2008 NCAA Softball rules,
Rule 22.214.171.124 If an injury to a batter-runner or runner prevents her from
proceeding to an awarded base, the ball is dead and substitution may
be made. The substitute must legally touch all awarded or missed
bases not previously touched.
This is similar to the rule that exists in baseball where a player injured while running out a home run can be pinch run for.