He said he was told to just walk away after their lunch at the facility, not say goodbye and not come back for at least 3 months. This would help her get better situated.
She does have a son close the the facility who is "supposed" to visit her at a later date. Is this a normal way to leave a person in a Memory Care facility?
I have some other unrelated concerns though, arising from his legal ability to place her. This man may be a live-in BF, but has your friend created any powers of attorney for financial and medical actions? Very importantly, WHO is paying for her stay?
Come back in Jan after all the Holidays are over, especially since Jan Feb and Mar can be tough for many.