There was nutty frequent flyer here in the sticks too...she abused the system so much a judge finally ordered her into a care facility of some sort- nursing home type place and I had no idea they could even do that.
It varies from state to state-here, there are a lot of low-to-moderately mentally retarded adults in assisted living facilities-they have been adjudicated as being unable to sustain themselves in an independent living situation-but it is really, really hard to get someone who is not violently dangerous committed-thank God.