Yes, you need to eat more. You're eating what your wife should be eating, calorically. I'd say aim for 2000+ a day and do more lifting if you want to change your body comp from a healthy slim size to a stronger, more ripped one. It'll be trickier for your wife to lose weight without exercising, but just continue doing what you guys have already done, but eat less. I'm 5'4 and at my heaviest at 126, I was eating at least 1500 and losing, but I was very active. I think your wife may need to drop to 1000 cals a day if she is inactive.