I'll make sure to just keep an eye on her and if the whistle persists I'll take her into the vet for them to investigate. I'm worried I'll end up hurting her if I try experimenting too hard lol. Appreciate all the info and I'm glad that it's unlikely to be an RI. I would be extremely surprised if it was considering how much attention I give my collection. I'm always on top of making sure each cage is spot cleaned daily along with ensuring humidity and heat is at the right levels. I'll keep this thread updated in case anyone else experiences this issue![]()