Lovebird Breeding Questions. I really need some answers here. Please help?

Okay so usually my lutino is always in the nestbox and my dutchblue is always standing on top of the box. The lutino barely ever comes out to eat or anything. Usually she just yells at the dutch and he comes in to feed her. Anyways, yesterday the lutino started laying eggs (only 2 for the time being). after she left the nest, the eggs were cold. I noticed that she simply stands in the box, she doesn't actually incubate the eggs. What is wrong with her? Secondly should I actually start soaking my birdseed for them? I have cooked egg (with shells), cuttlefish bones, veggies, fruit, and regular seed for them (anything I am missing?). When should I check the eggs again? I don't want to disturb the lutino in case I'm the reason she isn't incubating the eggs. The last two eggs though were infertile (at least I think they were). This might sound mean but I checked the two under a high powered light my dad has and only saw a yolk (no veins or anything). Should I actually be using a candle's light? I know I sound stupid but this is my first clutch. please help!