It might end this way:
Hannelore finally freaks out due to a medication interaction and kills Marten, Dora, and Faye. When she realizes what she's done, she leaps out the window and dies also. The next frame is the Reed, Bianchi, and Whittaker families at grave side, marvelling at the huge life insureance checks they received from the Chatham Foundation, because Marten, Faye, and Dora really were actors hired by Hanners' parents. The last frame is Hanners' gravestone "Hannelore Ellicot-Chatham - She finally snapped, like we all knew she would". Finis.