Best summation is a ticking time bomb sound. Broodies don't do it all the time, but once you hear it, you'll recognize it as an unusual sound.Since she left today she has not been back in, so guessing she isn’t broody any more. Helpful for me as I won’t be breaking her myself, when she was ‘broody’ or whatever she was doing, she was sort of repeatedly clucking and growling - sounded a bit like a dinosaur(I’ve never had a broody before so I’m not too sure what a typical broody voice is)