My kids know that some people are evil, real evil, and they understand that. Sensible people don’t just scream at an evil person. This mother is taking advantage of the decency of people who make her feel insecure, and as you say it could cost the little girl everything. The woman is a terrible mother, and as a result it doesn’t look like the girl has much chance in her life.
God has ways to do things, and that girl may be in for a wild ride in her life, followed by a cataclysmic coming to faith.