Kardashian initially threatened to sue PETA bosses - because she thought the organisation was behind the anti-fur protest, but they distanced themselves from the flour attack and insisted they had nothing to do with it.
It has since emerged that leading PETA activist Michelle Cho's sister Christina was the woman behind the flour-bombing - and she acted alone - but group bosses plan to back her if Kardashian opts to fight back.
A PETA spokeswoman says, "We know Christina as a very kind, wonderful long time volunteer. At a reception at our L.A. office last month she was with a group who watched this (fur farm) video and was visibly shaken. We will support her totally."
And Cho's sister, who was introduced to PETA by her sibling, adds, "I am not my sister's keeper, but I love her and have seen her sacrifice a lot of herself as a terrific activist. We work in different ways to help stop animal suffering. It is Christina who got me into the movement to protect animals, and I'll always be grateful to her for opening my eyes."