Classic case of obsessive-compulsive disorder....of the "collecting" kind.
Knew a teacher like that...her elementary classroom was a total disaster, and despite warnings from the fire department (in fact, the local fire chief's own son was in her class and he had him transferred out) she would only get more scared by the pressure put upon her to clean up her act and fill the room with even more crap.
Documentation of the behavior was implemented, per Union rules, but that is a months-long process, so during Spring Break, the principal got a few of us together, paid us overtime, and we spent 4 days cleaning out the room.
We found drawers FULL TO THE RIM with nothing but rubber bands; books in the coat room dating back to the '40's; hundreds of old newspapers - the entire experience was jaw dropping. We packed valuables (although, to one suffering from such a disease, EVERYTHING is valuable) in several trucks (we're talking patio furniture, a dozen or so broken computers, etc) and shipped them to a storage facility, paid for by the school site, for a period of one month, whereby she could collect them and take them home.
Upon her return, she immediately turned around and went home. We called in a long term substitute, and last I heard (this all happened, oh, about 5 years ago) she was teaching in another district.
Hopefully, she's getting treatment.
(Her car was like this as well...ever seen a car chock-full of just CRAP all over the back seats and passenger seat, up to the roof? If you have, you're looking at classic obsessive-compulsive behavior)