姑娘身经百炼早已百毒不侵
[gū niáng shēn jīng băi liàn zăo yĭ băi dú bù qīn]
This username 'A girl who has been through many hardships is already invulnerable' suggests someone who has experienced a lot and become resilient as a result. It conveys an air of toughness and indifference to difficulties.