Wow. That is something else. Sounds like she's crying.
Just a comment on your bees leaving and coming back...
Sounds like they are doing some practice runs for an up-and-coming swarm.
I don't know how those observations hives work, but from what I've seen, there doesn't look like much room for growth. Is there anyway you can get them into a regular hive so the hive can grow? Doing this might get rid of their desire to swarm. If you can do that, then later down the road use your observation hive for a split or start another package or what have you.