Thats exactly what I would do… talk directly, face-to-face… but as respectfully as I could.
Also, from what I can gather, Hareem doesn’t have a problem with her rejecting the rishta, its the image of hareem that her niece has in her head thats bothering hareem and instead of saying “ignore what people say and get over it” , its best to talk this out in order to prevent this image of hareem living a prisoner-like life grow and spread even futher.
Plus, she’s 19, she could do with some reality checks.