We just got this tiny hen and about 2 days ago she started making a high pitched trilling sound. Sometimes it will be a soft sound and other times it's really loud. She started doing it just a few times and now she's doing it more often than not. What could be her problem? She just won't stop! It's beginning to get very annoying and scary. She acts like a normal chicken. Could it be because she's quite new to my flock?