Sounds Did Flower sing?

I flushed the toilet at night and then heard a strange sound. Almost like clicking, but fast. I thought one of the girls were drinking and it was the sound of the metal ball, but it was too fast. Then there was a chirping sound. Chhiirp, like that. Not long, but not super quick. Not a chut, like they do when they meander around.

I went downstairs quietly and when I got by the cage I very gently spoke to the girls and then turned on the light. Flower was in a trance, her whole body rigid and standing on all four legs. The other pigs were laying down completely but otherwise acting okay. I wasn't sure if I woke one of them up with light or what. Flower was definitely acting strangely. All was fine the next day.

Is this the mysterious bird-like singing that some piggies do?
Here she is, annoyed with me, lol.