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Letter writer, The advice you got from the columnist is wrong. It is all wrong. The business of saving people works like this: one at a time, and you start with yourself.
There will be no saving of this child until she learns that she is a child (IE you and your husband take control [ie he wakes up]), that she will be taken care of (ie you and your husband are adults, she is not, and you two will meet her needs), and that she can stop trying to wrest control out of the situation. Ie until your husband decides to start being a parent, not a friend, and lets you do the same.
Please read about reactive attachment disorder or other attachment disorders. You may recognize your husband's niece.