It's harder to leave a bad relationship than you think. Fear of being alone, fear of judgement, fear of retaliation, etc. And there's also the stigma of getting a divorce. Her family may not be supportive and just view her as a failure.
The east has very old-fashioned values about marriage just like overly religious people in the west. Leaving her husband could be considered abnormal in her circle of family, friends (if she has any) and community. Add in that she'd be leaving her husband to be with a woman and it's a huge mountain for her to climb.
She's not stupid. She's afraid and probably has no support system. MC needs to be bold here and reach out to her to save her from the hell she's in. Not everyone can climb out of deep ass pit without a rope or ladder to help them. Once she has the ladder, it's up to her whether to use it. Probably with some convincing along the way.
Godspeed lesbians, godspeed 🫡