She has a heated conversation with Sarah (and we have the benefit of knowing Sarah is lying) and they decide they're not fucking friends at all.
Chris seems to have forgiven Kalon enough to sit and wonder how this is all going down, and how to convince Erica that he's not voting for her. Kalon suggests taking Erica into the voting booth with him, and Chris laughs, before going, "Heyyyyy..."
And that's what he does (telling Erica they're making "Bachelor Pad history" like that is even a thing). So now Erica is mad that Michael lied to her, and Michael's foolproof plan is falling apart. She has now upped her threat response, telling the contestants that if she goes home, she's taking the whole house with her. She's going to torch the place!
Everyone gathers for the Rose Ceremony, everyone feeling uneasy, and not the unsettlement that most sane viewers have every single moment watching this show. Rachel says if the woman who leaves takes Michael with her, she won't speak to them ever again. (But naturally it's fine for Michael to try to orchestrate someone else's ouster.) Erica tells us she's livid. It's always best that Erica tell us what emotions she's feeling, since her expression never changes and she speaks like she's just been chloroformed.
So: Blakeley, Tony, Jaclyn and Kalon are safe. So who are the women who are staying? Sarah and Rachel, not a surprise. It's down to Erica and Lindzi for the final rose, and it goes to Lindzi.
Erica's going home (Kalon does the creepy smile thing he does that makes him look like a pervert). Harrison tells Erica to take a moment to decide who she's taking with her, and Erica takes all of a half-second before laying waste to Michael, decrying him for not being a true friend. Rachel wipes away a tear, and Jaclyn and Blakeley look gutted too.
"Hopefully this will make the house a lot more fair," Erica says. Rachel tells Michael she doesn't want to continue, so I guess her backbone got voted out too. Michael encourages her to stick it out. Rachel accuses Erica of stabbing them in the back even though they were totally honest with her. But ... you weren't? So why do this now? "It doesn't matter! He's a manipulator! And the little puppet master lost at his own game!" she yells at everybody.
Erica continues for some time, calling Michael a crappy person and saying the best thing Holly ever did was dump him and marry Blake, because that means she's with a real man. I don't know who those people are. "You're a bad friend and a bad person, and I'm so happy I'm taking you away with me. I could not be happier that I'm serving justice, and this is karma."