My in law refuses to take her meds, and is aggressive and sometimes violent. I am wondering what my responsibilities and rights are if she continues this behavior after moving in with us?

She lives in CA with my brother in law but will need to move to NC because her behavior creates an unhealthy environment for the children. She has hallucinations, speaks to people who are not there, called 911 to report a non existent dead body in the home, cries continuously, has locked herself in her room often, refuses to eat, or take any of her meds. I am wondering what my responsibilities and rights are if she continues this behavior after moving in with us? It is understood that this is a temporary stay and she will move into her own place if and when she becomes healthy. I understand this may not happen. However, I am relunctant to become a care giver to someone with such erratic behavior. She receives SSID benefits. I wonder if these benefits would cover a nursing home or in home care? Both my husband and I work full time, so neither of us would be able to care for her if she continues this way.