It could have to do with the type of evidence. Perhaps it was very easy to quickly destroy and this ensured that she did not know to destroy it until it was too late.
This kind of reminds me of those police operations where they tell a bunch of criminals that they've won a free TV and to come pick it up at such-and-such location. Then, when the wanted perps are in the room, ready to sign the paperwork, in walk the police, informing them that they do not have a right to a TV, but rather a right to remain silent.
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