I wouldn't say she would have been safe easily but it would have been a much closer play than it was. From a neutral perspective I'm fine with the call either way. From a former softball umpire perspective I probably make the same call that was made. Right, wrong or indifferent you just hate to see the game of that magnitude end on a call like that. Bottom line is the umpire did everything by the book, had great position to see the obstruction and made a quick decision based on all the information he had.
One little nuance not picked up on by most observers is the 1st base umpire made the out call at the plate, the third base umpire made the call at second base and the home umpire was covering third. Without perfect execution of the 3 man rotation that is taught to umpires, the obstruction at third would have never been picked up. My guess is these three umpires are very experienced veterans and had all scenarios covered.