She's not the only one who has questions about the cadaver dog "hit". There is no excuse at all for LE to have not taken the carpet where the hit was. None. Even if there was a rug over it. Even if the hit was on an object on the floor. They would have taken the carpet, or at least the part of it that was under and around the hit. So, why didn't they take it? Maybe because they knew the cadaver dog hit was a false positive? (Or maybe because the dog never actually hit there?)
And, no - it's not likely that LE took the carpet and replaced it with other carpet. They do not do that on a search. They do not fix their messes.