Changing job search visa to student/language visa/chance karte visa

Hello,

I am asking on behalf of my sister. She finished her masters last year in November and she is currently in job seeker visa. Unfortunately she hasn’t been able to secure a job yet. Her visa expires on end of march. Can she changer her visa if she gets admission for a second masters? Or, can she change her visa into language visa if she gets admission to a language school? Or is there any other option for her to continue staying in Germany? Can she convert it to Chance karte visa too? Please let me know all the possible options. Thank you.

Regards,

Melina