I agree with the ruling in the OP.
The B/R was obstructed between first and second, the playing action was not finished, her protection for OBS was still in effect, I also agree with the result of placing the runner back on first after she was put out.
When I teach on the OBS rule, I advise to give any benefit of the doubt to the offense...the defense violated a rule, why do umpires (NFHS board) look for reasons not to enforce the effects of the obstruction in this play?
