Obstruction...or not?

[Andy]

ASA, NFHS rules.....

If a runner does not alter her path, can there be obstruction?

Play - R1 on second, clean hit to the outfield, R1 is waved home. F2 sets up clearly blocking home, but R1 never deviates from a direct line to the plate at full speed. As R1 starts to slide, but before making contact with F2, F2 catches the ball and tags R1 for the out.

In this play, I say no obstruction because even though F2 was blocking the plate without possession of the ball, her presence there did not cause R1 to alter her path or slow down.

Let's hear what everyone has to say.....