Because she has witnessed Jac being hard hearted towards a patient and not wanting to listen or consider another option than the operation she wants to perform . Fran thinks Jac should have more of a caring bedside manner and consider the patients more rather than rush in with what SHE thinks is best . She also thinks that Jac is jeopardising patients' lives and has compiled a dossier on all her cases. Jac is trialling a new device for the heart and Fran tells the patient's sister that she is nothing more than a guinea pig for Jac's ego trip.
Jac had trouble inserting the new device and it nearly all went wrong when it got stuck until the last minute when she managed to get it out ( or in - not sure which )