I am seeking advice on how to handle a 'hoarding obsession'.

My 50-year-old daughter has schizophrenia. She lives independently, which is good.  But she has the unfortunate habit of collecting things and leaving them on the floor. She cannot see that she is living in conditions that resemble a rubbish tip.

She had a NDIS worker who tidied things up, but for some reason or another the service was discontinued. 

I have just invited her to take action immediately, of face the prospect of me arranging a hard 'cleanout'.

Will an ultimatum work, or do I need to be more sensitive in my approach.  She has a low anxiety threshold. At the same time, I am her landlord, and am not prepared to have her live in a 'shit heap' so to speak.

Any ideas?