Meth during pregnancy

My brothers ex girlfriend is pregnant with a little boy and has been doing meth her whole pregnany. Is there any legal advice someone Can give me? Can she be charged with child abuse? My brother, who has a son with her was going to try and get custody because their son keeps referring to the baby as his brother, which it is but she is in no shape to raise a child. She has no car, job, or home...(The father of the unborn baby is now in prison for the next 18 years) it's very complicated.