You were only allowed to evict for safety reasons. 

I mean, really, now we're forced to let hoarders jeopardize their safety and our properties?

This means health and safety issues.   

Understandably, you want to address the situation if only to maintain the safety and comfort of your tenant and other residents is valid. 

Department of Public Safety is the data collection resource in the state...then on to the FBI.

Do you have thoughts on the "class" of neighborhood and overall safety?

But I would not do multiple background/multiple genders folks as room-mate as there would be higher safety issue and continuous drama.Also if you can, try to find property where you can divide the wall, and add bathroom/walls/kitchen,etc.

Make sure city in which this property is located that you check with the city if they require any permits and if this particular property is current with all health and safety inspections.

as a first time investor and going out of market.figure out a market  figure out the median price point for the SFR you want to buy and buy at or slightly above that .. this will get you in the safety zone.don't buy in a market were the median is say 150k and your looking at 100k houses. those will be life long renters tough to manage and tougher to maintain. 

Perhaps there's some way of having her declared a risk of harm to herself and others and removed from the property for her own safety.