The mother is 100% at fault.
If she has guardianship over a person who is too incompetent to make decisions, then that person should not be left at home alone.
In this case, the mother should be charged with neglect or abandonment.
I’m not too sure about mama’s mental abilities putting her daughter out there for any and all pervs. Mama had to have been the one to call the msm out to show the world their home, their last name, what mama and daughter and the rest of the family looks like and hey, pervs, her daughter will walk out the door with anyone.
That's ridiculous. My fifteen years old doesn't have the competence to make adult decisions such as buying a car but he can be left home alone unsupervised, as can plenty of adults with Downs Syndrome.
There are all sorts of level of wrong in your comment. I have a mentally retarded sister. She can do fine at home by herself for several hours, but cant drive, do her own laundry, remember to bath, or make her own food.