She should not contact the police--stupid advice from someone who lacks experience or is in denial of what it's like being a woman on the ground. That he was able to deceive them was probably because they share the vigilante romance and approve of what they consider righteous brutality. Her experience with them could tear her down further and put her in greater danger.

She needs to contact women's advocates for her own safety and once that help is secured, she could then get help and support from them concerning which local police officers are good ones who are concerned about sexism and racism and help her make connections with those, and how to talk with them about this. And sadly, it's possible there are no members of the police force in her area who she should approach. And there may not be useful advocates for women and abuse survivors in her immediate area.