What's she mean by "green in judgement?"

Native speaker’s answer
Rebecca
"Green in judgement" refers to a time when you are young, carefree, and innocent (like a child). Another way to say this is "salad days". This expression is only used in Shakespear's writing. Ex: As a child, she was green in judgement. Ex: Because her parents were so protective of her, she was green in judgement.