Why is my rat making this sound?

it may not be anything wrong. she's eating fine and acting fine and sometimes animals just make sounds, especially if you go to her cage to feed her maybe she was just trying to get ur attention. my guinea pig squeaks at me when she wants to be held so it may just be that she wants some attention. she seems to be fine, since u say she is breathing fine and nothing is coming from her eyes or nose, she probably just wanted some love and to be held or talked to, all living things need attention, especially pets kept in cages