I need some advice on healing lupus with a vegan lifestyle...

My friend is fighting through her new diagnosis of lupus right now and has agreed to try a more holistic approach. All her doctors were wanting to do is try medication after medication on her and she is only getting worse. She wants to go vegan because she has done a lot of research on the healing powers of it. Have you or someone you know gone through this? Please give any advice and information you have :)