The actress will reprise her role as Remy 'Thirteen' Hadley in the penultimate episode of the Fox medical drama on Monday (May 14).
Speaking about the upcoming instalment, Laurie explained to TV Line that Thirteen "reappears [to House] in the form of an intervention almost".
Lerner added: "We did everything we could to get some people to come back. Olivia was gracious enough to come back and she has some sage advice for some of our people."
House creator David Shore previously revealed that Thirteen will primarily be back to "support" Wilson (Robert Sean Leonard) through his cancer battle.
Former cast members Amber Tamblyn (Martha Masters), Jennifer Morrison (Allison Cameron) and Kal Penn (Lawrence Kutner) are also expected to appear in the House finale on May 21.
Watch cast members discussing House's penultimate episode below (US only):