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There is no auxiliary benefit for a child over the age of 18 years, unless the child is still in high school, or the child is mentally disabled.
Based upon your described circumstances, I do not believe that your grand daughter can qualify for continuing auxiliary benefits from the Social Security Administration.
I realize that my answer may not be exactly what you were hoping to read. However, under the circumstances, the best that I can do is to explain what the law is and is not, so that you can avoid expending valuable resources looking for answers that do not exist, and concentrate on the options that are actually available.
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