The actress suggested that her character's relationship with Jeremy (Steven R. McQueen) could become strained over the course of the third season, E! News reports.
"I don't know anything," Graham joked, before adding: "I do know that Bonnie's going to have to deal at some point with Jeremy's (Steven R. McQueen) new ability to see his ex-girlfriends, who are deceased because he now can see the other side. So we'll see how she deals with that."
She continued: "And other than that it's just going with the flow and seeing where they take it. As of right now in the show, where it left off in the finale, Stefan (Paul Wesley) went with Klaus (Joseph Morgan) and is on this crazy feeding rampage and all that. So we have to figure out how to get him back."
Kayla Ewell, who plays Vicki, recently revealed that ultimately all three of Jeremy's girlfriends will come face-to-face for a "huge epic fight".
In July, Vampire Diaries executive producer Julie Plec said that Bonnie will face problems in her love life next season thanks to the presence of Vicki and Anna.
The Vampire Diaries will return for its new season on September 15 on The CW.
Watch Digital Spy's recent interview with The Vampire Diaries cast members Katerina Graham, Steven R McQueen and Candice Accola below: