So why does Joy suddenly want Danny dead at the end?

Did i miss something? She figured out her father was a liar and was done with him, and shes been on Danny's side throughout the season, but now shes open to the idea of killing Danny? Just like that? Just like that shes ready to be a stone cold killer and conspire to murder her childhood friend shes always cared for?

This makes no sense at all.

Again she found out what a lying scumbag her father was and that Ward was right about him, so why is she suddenly wanting revenge by killing Danny?