Joe pretty much answered the question (though I do have one small issue with part of his answer
).
An obstructed runner can be awarded any base that the umpire judges she would have safely reached, absent the obstruction. So it would be entirely possible for the runner from second on this play to be awarded home. This is true for NCAA, ASA, NFHS, NSA and all the rest.
Personally, if the tag play at home was anything even remotely close I'm giving the benefit of the doubt to the runner. If she is tagged out on a close play, we have a dead ball and then the runner is awarded home. But that's not a sure thing in all cases. The variable is what the individual umpire saw and how he judged it and that can vary from one person to the next.
Generally, the runner has a right to run the bases and the fielder has a right to field the ball, but there are times when one or the other has the right of way. This is where I have a slight issue with part of Joe's answer:
"Unless that ball is almost on the other side of second base, I have a tough time calling obstruction because the shortstop is "making a play" on the ball, even if she might not be able to get to it."
For it to NOT be obstruction, the fielder has to be in the act of fielding a batted ball. That means that there has to be some reasonable chance of the ball actually being fielded. If the fielder
isn't able to get to it, then she is NOT in the act of fielding the ball. Just moving in the direction of the ball isn't enough to satisfy the requirement of being "in the act of fielding".
I've had this play in my games a few times and it is one where you have to make a quick judgment call. One that sticks out in my mind from last year was a runner on second and a line drive hit directly over second base. The runner and fielder collided maybe 15-20 feet off the bag and the collision happened just as the ball was about over second base. The defensive coach pleaded for an interference call on the runner, claiming that his fielder was "in the act of fielding the ball". Well, she was kind of heading in that direction... But there was zero chance of her being anywhere close to even getting a glove on that ball- unless she had twenty foot long arms!
Speaking of strange calls in college games...did anyone see the Ohio State-Purdue game today? There was a case of a runner interfering with a thrown ball- one of the most obvious and blatant such interferences I've ever seen. This runner reached up over her head and very deliberately swatted a thrown ball away from a fielder. The runner was called out, but apparently the umpires never called a dead ball and let the other runner on base continue advancing. The lead runner swatted the ball as she approached home plate, while the trailing runner was just hitting second base. Yet at the the end of the play the trail runner had advanced to third and the umpires let her stay there. The announcers seemed pretty clueless as to what had happened. For the life of me, I can't figure out why the runner wasn't returned to second, which was the last base she had touched at the time of the interference.