Wait a second, Peter, unless you think her concession of a 4 should be valid, you have two choices;
Sagstrom unwittingly broke the rule, thereby essentially conceding the first putt for 3 (which is what happened), or
Sagstrom intentionally "disturbed the scene" (as you refer to it) so as to not allow the ball to fall in.
I don't see another alternative view.
The "rule" seems to require interpretation as to the ball hanging over the hole. The fact that she didn't allow anyone else to consider that was the fault.