神经质小妞
[shén jīng zhì xiăo niū]
The English equivalent for this nickname would be something along the lines of 'Neurotic Girl'. A 'Xiaoniú' is an affectionate way to describe a little girl or woman, while the term used here also carries connotations of being overly anxious or neurotic. Thus, it implies a playful but potentially self-aware critique about being easily worried or excitable.