Request for Guidance on Sister's Marriage Issues

Dear Sir/Madam, I am reaching out to share a concerning situation regarding my sister’s arranged marriage and to seek your advice on how to proceed. After approximately 2 to 3 weeks of marriage, my sister faced pressure from her husband’s family for additional gold as dowry. In a troubling turn of events, they threatened her and insisted she return to our home without the promised dowry. As a family, we felt we had no choice but to provide the additional gold, allowing her to return to her husband’s house. Unfortunately, this did not resolve the issues. Subsequent to her return, we were informed that her husband’s family continued to raise trivial complaints, including her wearing optical glasses, despite her using them during her engagement. These frivolous reasons led to my sister returning home again. We wanted to give her some time to decompress after these experiences. After a two-month period, we, as a family, visited her husband’s house to address these issues, emphasizing that such behavior is detrimental to her well-being. However, her husband remained uninterested in resolving the matter, continuing to cite petty grievances. We are deeply concerned about my sister’s situation and well-being. Given the circumstances, we are looking for effective solutions to ensure that her marriage does not continue on this troubling path. Could you please share your insights or guidance on how we can address this situation? Any advice would be greatly appreciated.