What should a girl committed to the teachings of Islam, who also contributes to the memorization of the Quran, do if she is asked to adhere to a specific color for her hijab or jilbab, which causes her psychological and social embarrassment?

The purpose of the শরعي (Shari'i) hijab is concealment with something that is not an adornment in itself and does not attract the attention of men. Any color that fulfills these conditions is permissible to wear. A teacher should not compel her students to wear a specific color, but even if she does, this should not be a reason to abandon learning and teaching the Quran.