凉心姑娘重情重义
[liáng xīn gū niáng zhòng qíng zhòng yì]
'凉心' means ‘cold hearted’ but here it might imply experienced; '重情重义' indicates valuing feelings and righteousness. Thus, this username could be understood as 'Cool-hearted Girl Who Values Emotions and Justice'. It implies she remains unaffected yet cares about people and ethics.