Hypoactive Delerium

Hi ladies. Mum aged 92 in a care home since last December suddenly deteriorated on Saturday. She became very confused and unfortunately fell and cut her head.
She was taken to hospital had a CT scan and blood tests. There doesn’t appear to be anything amiss medically. I spoke with the Dr Saturday afternoon, and we decided that she would be better in the care home rather than hospital.
She hasn’t really woken up since Saturday and hasn’t had any food or drink. The GP will be visiting her today.
Anyone else had this to deal with ? I’d never heard of it before now.