many jobs in Napa provide 'basic' accom with the job however, this should be checked out first to establish if she is sharing, security etc! The end of June may be tough as many of the jobs will be taken by then and therefore the ones with better accom etc will go first.
You are probably better off getting her a cheap RO Package deal for a week or two,and finding accom for the final 2 weeks of the month! This also gives her the option to return after 2 weeks if she cant find anything she wants, or decides not to stay!