After you defeat her, DON'T start the operation right away. Choose the option to leave. Then, wait until Swann approaches her. Start the operation, and ask Swann to hold her steady(3rd option). Then, choose second option(with forceps). For the last option choose the first one(slowly).
I, too, struggled with this one. The key to it was to wait until Swann walks over to her so you can ask him to hold her.
