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Dear concerned aunt,
You have every reason to be concerned. Your sister has fallen into a pattern or meth use, in all probability. As a former (?) alcoholic she is also prone to addiction. Meth is probably part of her daily lifestyle. Your niece may be exposed to the lifestyle and even the dangerous chemicals used in its manufacture.
One of the symptoms of meth use is extreme paranoia, which may characterize your sister's behavior.
The child is definitely subject to neglect
, if not outright psychological abuse. Who knows how much more abuse is going on, especially with drug-crazed friends passing through her family, and probably her household.
If you go through social services you are taking a big risk, in my opinion. Some solve problems, while other increase them.
Is it possible that you can take care of this child? Talk it over with your husband / close family, then if they agree, talk to the girl. If she agrees as well, talk to the sister. Try to avoid legal action.
To save a child, sometimes legal action is required, and you are certainly an interested party.
Weigh your options. I believe that girl needs to be protected and nurtured and you are perhaps he best hope in the world.
I hope that I have given you some important things to consider, and if you agree, please accept my answer, and help me continue the important work that I do helping others in pain and need.
Great blessings to all of your family,
Elliott Sewell, LPCC, NCC