I feel the same way, Holly is definitely my favorite female character among them all. I have thought of that option yet, but I'm certainly interested to give it a go.
At the same time I feel like Ivy has gone from being annoying, to being a pure narcissist.
She poisons Lena's life, lottery destroying Holy life, sleep with Mike even if she know that Lena do that to and that Mike already have a GF.
On top of that I believe that stelkamp thing for Ivy is just a tool for her to work as a callgirl, or at leat I have this impression.