Hysterectomy - a cure the lupus?

My partner has a lupus rash on her cheeks. Her Doctor is of the opinion that it is brought on by a pregnancy hormone and it has stayed in her body thus giving her this rash. She has been sterilised and is on a course of Depo-medrone injection's every three months, this has not helped and now her G.P. wants her to have a Hysterectomy hoping it will finally cure the lupus.