If she had voluntarily let him in and he was not a resident and attacked someone or burglarized a unit she could have been held civilly and possibly criminally liable.
Why didn't he have his security fob?
If he didn't have it then he calls the apartment manager to be let in.
Why you refuse to see this as a basic security precaution is beyond me.
“Why didn’t he have his security fob?”
We don’t know that he did not have his key fob.
“If she had voluntarily let him in and he was not a resident and attacked someone or burglarized a unit she could have been held civilly and possibly criminally liable.”
Unless she committed a crime, she would have no criminal liability.