Monty's started to do this very loud chirp and won't stop! She's healthy and After two days it's starting to get a bit annoying. I've tried everything to get her to stop- letting her out, giving her a mist for her pin feathers, music or tv to calm her down. Does anyone know why they make this noise and how to get them to stop?
There is some really good information that FaeryBee provided for you and I don't know if there is anything else I can add.
The biggest thing is to try not reinforce the behavior. Birds are intelligent creatures of habits and it can be hard to untrain behaviors we've accidentally reinforced, like when your bird bites and you scream, or yell or cry.
Everytime your bird screams and you give her treats to calm her down you're reinforcing the screaming. Everytime she screams and you let her out, you are reinforcing that screaming. Everytime she screams and you put her back into her cage you are reinforcing that behavior.
Bird owners greatest strength is patience and learning to apply it--and it's not always easy to do.
One of the best ways to overcome bad behaviors is not to reinforce them,
ignoring does help. Leaving the room can help as well, it was actually FaeryBee's recommendation for me when I got my lovebird Juby years ago and he was screaming, was to leave the room and not return until he was quiet and then reinforce the behavior I did want. So when he was quiet I would go and reward him with praise and some treats and it worked great.
Birds are not quiet creatures, they will be loud from time to time for different reasons. You could have accidently added something to the room that the bird has yet to adjust to. It could be hormones, which is probably the most likely culprit. Either way, the best thing you can do is follow the links that FaeryBee has provided and try to be patient.
Reinforce the good in your bird, be patient with your bird (and yourself)
and find ways to distract yourself from the noise. Because sometimes there is nothing we can do other than let our birds be themselves, allowing them to sing, whistle, chirp and scream.