Obstruction?

[Bluefoot]

Since the runner did not slow down or did not deviate her path, as you say, if the catcher's leg or foot impedes the runner from touching home plate (slows down or prevents), then it would be OBS, or as they say in Italia, "Obstruzione!" (con alza la braccia destra)

But it does not make sense to say that the runner did not deviate her path to home plate, based on what's seen in the picture. If she was running directly from 3B, then for her not to have deviated, that would mean that either she took a path 2-3 feet in foul territory, parallel to the base line, and hoped to stick out her hand as she went by home plate (not very good/smart), or that she took a HUGE wide turn at 3B, ran around her 3B coach and ran a curved path toward home plate. Either of those is unlikely, and the play is most likely OBS.