I noticed today that Stella's got a little whistle to her breath... I know that sounds like this are symptoms of RI, but I just don't know what to do next...

Her humidity is kept at a range of 40-50% and her temps are ambient 73-76 with a hot spot of 92.

The only thing that has changed recently is that I put her on aspen/cocohusk as opposed to all cocohusk.

What should I do?