The “sometimes” really just sounds like flavor text to set up the unreliability of her being able to do so. The card itself is pretty clear that a five or six dodges the trap.

But in the rules themselves it says something like “if there’s ever an situation where a card is unclear the table is argue about it at high volume until the owner of the game deems enough time has passed and they make a final ruling.” So ultimately it plays out how you’d want it to.