It's not unusual for bees to replace a queen. I've had plenty of hives replace a queen that seem perfectly fine. This queen had a very nice brood pattern, and she was replaced.I'm also trying to decide if my #1 hive swarmed and we completely missed it. Still so weird we only found one cell. There is a lot of brood and bees in there, as well as eggs and larvae. So even if they did, we're still in good shape.
Same cell after all the brood emerged and the new queen was laying eggs.