It's a wonder that after the superdickery that Superman and Batman pulled that she's still sane. I'm reading through the 1950s "World's Finest" issues featuring the Superman-Batman team, and for the first few issues or so, the number of times they switch identities to fool Lois is astounding.
Every time I see Lois getting more and more confuzzled, I can't help but think, "And so her slow slide into insanity continues..."