Brother.... if she is wearing the hump in the hijab as per modern fashion it is Haram, and not only she will be responsible for judgement on this, you will too as now you know it is not allowed and are encouraging this.

The Prophet (PBUH) said of women of future generations "women who would be dressed but naked and on top of their heads (what looks like) camel humps. Curse them for they are truly cursed." (Muslim)