Trivia: Director Kevin Reynolds shot two versions of the scene with Villefort and Monte Cristo, one in which the pistol is loaded and one with the pistol not loaded. The original cut of the film had the loaded pistol, but it was changed after test audiences expressed their preference for an unloaded pistol scenario, thus having Villefort be forced to go to prison and suffer as Edmond had.
Trivia: Dagmara Dominczyk plays Henry Cavill's mother in the film, even though in real life she's only seven years his senior.
Answer: I believe it's just because there is a dirty smelly man that she doesn't recognise visiting her ailing grandfather, she just wants to keep an eye on things.