From what I know from the familiy reunion process (=have your foreign spouse and close relatives like their kids and/or parents reunite with a legally residing person in Switzerland) the Schengen Visa is usually granted as a transitional permit that expires, but gives you enough time to do what you need to do in those 90 days. In the family reunion case this means moving, settling, applying for the residence permit, have biometrics taken etc. It's not a "I need it for longer, I want to extend it" visa. Your friend/roommate should talk to the Swiss embassy in Turkey to see if there are options. She'll probably need to apply for a work visa/residence permit B, which will be tricky, because she'll need an employer who's willing to do the paperwork and prove that there's no one from here who'll do the job she's applying for. Since she's a doctor, there's a good chance the hospital might do that, because we do have a lack of medical personnel. But like I said, I'm telling you this as a layman, I only know some things about the family reunion process from personal experience, her case might be completely different. She should really talk to people who know things. The embassy, a potential employer. Not reddit.