What evidence are you waiting for? Her to come home abused or pregnant? I'd say 'dead' but apparently that does not apply here. At least, not for very long.

Mama is upset and worried, and rightly so. She does not want to wait for this evidence you're so bullheadedly waiting for. How do you think she would react?

A better question: What would you do if Mama, your wife, were doing the exact thing that Makaria is? Saying the things that she is? If she had no employment or money and did not come to you when she was seemingly in distress, wouldn't you care to know who her benefactor was and what their intentions were?