Fast-pitch softball question for Umpires please not coaches who don't read all the rules?

NHSA Rules. Runner on second base no outs, ball it hit to right field and caught. The base runner tags and heads toward third when the shortstop who is not makeing a play collides with her. I rule impeidment and call a delay dead ball. Runner easily makes it to third, however, starts walking off the bag. The throw from right comes to the catcher who then throws her out at third. I called her out as by my ruleing she would have only gotten third if not impeided and the rule is that she only gets the base she is going to. Was I correct?