Has anyone ever had a chin swell up in the belly area overnight??? I went into the chin house to check everyone yesterday morning and noticed that my pw female Fiona felt weird around her stomach.......It doesn't feel hard it feels like air......She is eating, drinking, urinating and pooping fine.....I have never seen anything like it before.....Nothing has changed in the chin house or her cage so I am kind of at a loss.....Any suggestions??