Incessant Scratching

Something is wrong with Gibbet.
She has started scratching like crazy.
I have combed through all her fur and found no fleas.
I am wondering if maybe her skin is losing moisture or something.
She is losing fur from her tail and back legs.

She just keeps scratching.
She woke me up several times last night with the sound of her little bell.
It jingles a lot when she scratches.

She also fell asleep on my stomach last night.
That does not happen.
Something is wrong with Gibbet.