I've almost never gotten questions. Shops with nothing wrong are not necessarily approved immediately. Sometimes they are, sometimes not. I did several bonused drive-in shops over the past two weeks. Three were outstanding - WOW shops. Two of those Wow shops were instantly approved. One was not. And I've had several not-perfect, not-Wow shops get instant approval. It's pretty random although it seems most Wow shops are instantly approved. Also, some clients have shops that are approved instantly, regardless of whether they are good or not. The fast chicken shop is always instantly approved without review.
When a shop is bad and it is addressed with the employee, the employee likely is not happy. Do you like getting a bad performance review? If your boss says you did perfect, you don't argue or ask questions, right? If your boss says someone reported you for doing a bad job, do you ask questions? Do you argue? I sure do. I want to know all the details. When you give a bad report on an employee, if they address it with the employee, they need details. There's plenty more you can say beyond "she didn't speak at all." You can describe her demeanor and body language. You can give a blow-by-blow report of what she didn't say and what she did instead of speaking. For example: "Employee glanced at me but did not make direct eye contact. She held a cell phone in her left hand at shoulder level and looked at the cell phone four times during our interaction. She did not speak, although I said "Good Morning" when I arrived at her window and "Thank you" when I left the window after completing our transaction. She nodded slightly when I arrived and made no acknowledgement when I left." That description is something the manager can discuss with the employee rather than just saying "Some mystery shopper thought you didn't speak so you got rated bad on the shop."