But it does mean I can write for her in a way I couldn't with characters who are more obviously upright and honourable (and as ever less fun. The villains do get the best roles, followed by the ambiguous characters like Eileen where you're never quite sure what they're going to do next).
Rules, for Eileen, go out of the proverbial window as and when it suits her. There's a lot of fun to be had writing situations, relevant to the overall plot, which reflects this. And there is always the fun of a hypocrite either being outplayed by someone better at hypocrisy than they are or by being brought down by that attitude.
So let's hear it for the fictional hypocrites. Almost certainly you wouldn't want to come across them in real life but on the pages of a book, in a story... let them entertain us!