It is truly amazing how fast a queen can fatten up. If I had to guess, they superseded or raised an emergency queen and she is just starting to lay. Since you didn't have the queen marked, we will never know for sure :evil: I'd give her a day or two and check back again. Often it takes a few days for them to "get going". Then again, I'm not a big fan of emergency/supersedure queens as I have experienced a higher rate of failures with them.