Thanks for asking this question Tyanna. I had never even thought to ask this since the oils are used in candles, room fresheners, etc. I run an ultrasonic diffuser all the time with peppermint oil or lavender.
I know eucalyptus oil and lavender are safe in a diffuser around babies. Vicks is run in humidifiers for them all the time. I would think the humidity from diffusers would help? What do I know though. My diffuser is one room away from our tort. Does anyone know?
I think diffuser would help overall room humidity, which could initially help the humidity inside of the enclosure, depending on how "open" your enclosure is in, and how big the humidifier is.
I have a tiny Young Living one in our room, and since our house is the "lower" part of a duplex (basement), we really love running humidifiers and diffusing oils along with it. I struggle with severe anxiety so lavender oil is a must for me.
Many people use humidifiers and connect a hose to direct the humidifier into the enclosure, to help humidity!