It's not a tumour

Or perhaps it is.
Fauna got out of the cage recently, and began acting strange shortly after.
The vet thinks she might have a tumor of the pituitary gland. From what I've read online of symptoms, I would tend to agree.

She's acting confused and very affectionate. Poorly coordinated. She presses her head against the wall and against my hand.

Prognosis: wait and see for now. And don't chastise me for getting attached. They are my first adult pets and so far it seems a lot like a first love situation. Gimme gimme gimme---ow ow ow...