although she has left, she is still dangerous to your family and other. Pls call the police if the videio is still kept by you. She will be arrested and can never come back to HK.
I'll call the police at once as you have videotaped her behavior as the evidence. Please inform the immigration department as suggested by another mum so not to permit her visa application anymore. My sister got one Filipino "kidnapped" her daughter in the room for three hours. She was so kind to let her go without calling the police. A few months later, she met her in Central and heard that she had got a new boss. What a pity to her new boss?