My girlfriend's parents emotionally abusing her.

I am a 20 year old Hindu boy . I am in relationship with a Muslim girl who is stuck at her home due to lock down. Her parents are emotionally torturing her and threatening her in different ways. Her parents have done so from her childhood. Her parents don't know about us and we are doing our best to keep it that way. My parents have agreed to let her stay with my family and are ready to support her financially. I wanted an advice on whether she can leave her home without her parent's consent and without their knowledge and stay with me. My father is ready to let her stay at our house as a family member if and only if there won't be any legal issues and we can't let her parents know about our address as they may come at our house and create a rustle.