[Raph]

I don't think she's targetting Nikki per say, just using her as a pawn as she has ties with everyone else. Even if Jared/Kelsey vote to evict Nikki, Joel/Tim will evict the brothers as they both benefit more from Nikki staying. Cass gets the tie vote and sends the brothers home, regaining trust with Nikki, whilst not making any enemies during her HOH reign - something that all the past HOH's have failed to do!