Steve explains — but WARNING, there are Episode 9 elimination spoilers in here:
As for the other information I received, I actually was told back in November that someone returns to the show, but didn’t have any details surrounding it. I heard again [recently] that someone does come back, and the previews [that aired two weeks ago] clearly show it’s Kacie who returns in Switzerland (after getting dumped at the hometowns), to warn Ben about Courtney. Not sure at what point in Switzerland she returns, if it’s before or after Nicki leaves, but she does come back to talk to Ben about Courtney. Nothing more, nothing less. She doesn’t come back to try and win him over or ask back on the show, but she shows up in Switzerland to let Ben know Courtney is an evil witch that needs to drink a bottle of poison.