Is 48.0 kg a healthy weight? I am 157.5 cm (5 foot 1) and my mom is worried and says I am underweight, and she doesn't even let me go down to 45 kg?

She says I need to be at least 50 kg, even though she thinks even that is also underweight and that I should consider myself lucky that she lets me be even that. Is she correct? She also said even 56 to 57 kg would be a normal weight for me, but that is so ugly and bloated. Also when I use a BMI calculator, it doesn't say that I am underweight. My bmi is 19.3. And also, its not like I can hide the fact that my weight is getting lower from her, which is so annoying. She found that its underweight on some website of "weight charts" yet bmi calculators say different? If i don't get to that weight, she also won't let me go to a concert. How do I even convince her otherwise? It sucks that I have to wait till I am 18 to weigh whatever I want.

Is 48.0 kg a healthy weight? I am 157.5 cm (5 foot 1) and my mom is worried and says I am underweight, and she doesn't even let me go down to 45 kg?
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