Boy oh boy, we are a harsh bunch around here! "A rule is a rule". "She shoulda known". "Give 'em an inch and they'll take a pound".
What ever happened to common sense? It was a frickin apple for god's sake!
Here's an idea: Tell her she can't bring the apple in, take it away from her, then move on to more important issues of security and immigration & customs enforcement.
No, we don't need lawyers and lawsuits over this. Nor do we need flak-jacketed hardasses making a big deal out of an apple. We have lost all sense of proportion in our society.