The Ethics of Bad Calls

[The Armchair]

In tonight's US Open match between Sharapova and Petrova, Sharapova was on serve in a deuce, up 7-5, 1-3. After a bit of a rally, an errant ball bounced onto the court. Sharapova stopped play and pointed to the rogue ball, asking (rightfully) for a let. A ballgirl ran halfway across the court to retrieve the ball, and while Sharapova and the crowd were expecting for the obvious ruling, the chair judge declined. The judge claimed that she had not seen the ball enter the court. Let's take her at her word, or at least let's accept this explanation as the one given (it was hard to tell, but that is what the commentators and my expert DVR skills gathered).

You are Petrova. You were just given a gift point that may very well mean the difference between winning the set (and therefore the match) and losing it. However, it is 100% clear that a let should have been ordered. Assuming that if you speak up, the point will be erased, do you? Why or why not?