Should I call a welfar check on her?

So, my “sister” in law had a history of drug abuse and mental illness. She already has a 8 year old daughter who isn’t living with her but, is living with her grandma (her dad side). My boyfriend sister recently had given birth in September and she did send us pictures and we FaceTime. Ever since she left the hospital she disappeared and hasn’t talk to her grandparents, her brother anyone besides her daughter. Her daughter wanted to face time her sister but, she’s refusing too and is only talking on the phone. She was telling her daughter to lie to us that she saw her sister but, she hasn’t ever since she left the hospital in September.

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