I'm not Cathe, either, but I've had the same results as Wendy. It doesn't seem to matter if I work my abs 5 or 6 days a week or just 2. If my eating is on track, then my abs are flatter. So, I now aim to work them 3 times per week, but if I only get in 2 times, I don't sweat it.
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind. - Dr. Seuss