How to save oneself& family against false dowry&domestic violance

My maternal uncle got married to a woman(arranged marriage). Everything was normal but when my uncle returned home (with that woman after the wedding rituals ) she started behaving in a weird manner . She started abusing everyone , biting people , started threatening everyone that she will kill herself and all of the family will go behind the bars . Then our family members locked her in verandah and called her father . Her father came and said that he will take her back to his home and get her treated(medically). But it was just a false promise. We never saw that woman again in normal situation . The woman's father threatened many times to take her back but we all were afraid of the consequences. This process continued - he threatened and we tried to make him understand that he should first take her to a doctor and then we will bring her back but he (superstitious person ) took her to tantrics and babas all. Now he filed a false complaint in a Mahila thana against our whole family. We need serious help.