Does my sister really look weak? How do I convince my sister to gain weight?

My sister has body image issues and eating disorders... Me, parents and doctors have convinced her to take proper food & nutrition but failed to bring any change.. Is she really weak? What could be the further effects on her health?
Does my sister really look weak? How do I convince my sister to gain weight?
Does my sister really look weak? How do I convince my sister to gain weight?
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