Is my mum being overdramatic?

I've done the master cleanse before and she was supportive and I've started it again now but this time she really isn't helpful and she isn't very supportive and thinks it's just for quicken weight loss. I'm not doing it as a weight loss fixl I'm doing it to clense my body of all the toxins and ones I've finished I'm going vegan. Another thing she isn't happy about but I really don't see the problem. It's a lifestyle choice and I'm mixing it in with going to the gym because it is healthier. She says because I'm 15 I shouldn't be worrying about how I look and she thinks I'm going anorexic. but I want to look after my body? I don't get what the problem is.