Are you asking if you should ask her to consider him being evaluated at home?
He may be paranoid
Depending on their state of residence, some local community service agencies also offer mobile assessment.
To find out if one is available in their area, she may phone the United Way toll Free #211 dialed from a land line. Or google Community Mental Health and his area of residence/state.
If he is violent or there is a possibility that they fear he may hurt himself, she can even phone 911. In those case, they can transport the individual to a crisis stabilization facility.