Young Tiny Models Is This A Healthy Weight, Lose 5 More Kilos/10lbs?

Is this a healthy weight, lose 5 more kilos/10lbs? - young tiny models

It is a question for my youngest sister's 13th
Sure, all the celebrities tiny and anorexic models out there today, given that they only want to know if we can maintain a healthy weight and 10 pounds / 5 pounds harder to lose.
Details:
Sex female
Age-13
Height-165cm/5ft5in
Weight-49kilos/7st10lb

I lose 10 pounds from the 7st10lb and in accordance with the Wii Fit is still a healthy weight. But I think that the weight ... What are your views?
Thank you,
Lisa.Rr x