Is it from Шкатулка? :) Aida translated it well. Yes, this sentence sounds a little strange, but the text is for complete beginners, and the authors tried to use the simplest phrases. It seems though that the continuation clarifies the sense: "[She thinks that it's necessary to look at the mirror to control her look], but Egor thinks that it's stupid".

It's a weird sentence, but grammatically correct.

It is a strange sentence. But if I was to translate it, this would be the result: "She thinks that looking at herself in the mirror is necessary." I am not sure what the context is; however, it might be referring to looking at oneself in the mirror to not look ridiculous.

Perhaps you meant... Before you condemn someone you need to look at your actions.A mirror is like a reflection of the human soul

It could mean: She (always) needs a mirror to look at herself.