If there is a working law in Nigeria, justice will not be delivered like this. 
If justice can be trusted, this victim of serious grievous assault and a possible character defamation would have had a recourse in both criminal justice against the mob involved in brutalising her and also in tort - civil law.
But do the poor, weak and vulnerable have a right in Nigeria?
Just get accused of anything by someone with power and influence over you, fellow poor people, the police, courts and even the army may come against you who is a victim. 
Nigeria is not a safe country for the majority of the population, especially if classed as poor, disabled, widow, elderly, orphan, etc and to some extent unemployed and uneducated.
Ideally, the police should follow this video evidence of unlawful act and arrest the criminals as a duty in law enforcement, public order and justice.