Is 57kg to heavy for a 13 year old girl?!

Hi I was wondering if 57kg for a 13 year old girl is too heavy?? Im also roughly 157 cm tall too Im a gymnast well i just started and im pretty musculer i also did ballet for 8 years which made me more muscley please help me ! Thanks for reading :D... and i was wondering how do you lose weight easy in 2 weeks??? at my age