With all due respect by "transient", I meant the formal definition from the encyclopedia.
tran·sient
noun
1.
a person who is staying or working in a place for only a short time.
That does not imply they or the area is less than middle class. I stayed in one of them 5 years ago, when I had smoke damage in my Zionsville home (elderly friend of my Dad, left something on the stove that caught fire). Some folks I talked to were only there for a couple of weeks like me, some were long term. But unfortunately, if you have people in and out it's less likely that someone would be aware of her missing and report anything suspicious they saw.