if one is smaller than the others, that is a sign for concern..they should all be same size and hard....shows she needs calcium..so get calci-boost or another calci supplement asap..also I trust you are leaving the eggs with her...do not take them away or she will lay to replace..you can also buy false eggs on line at birdsupplynh.com..they come in handy if any break etc..that way, you can slip one in without them noticing..also you can replace real ones with false if you dont want babies....at any rate put a small paper towel on the grate for her to be a little more comfy....she will be extra nasty right now and want lots of food...poops extra big too....25-30 days or so before she abandons...then shake up her world....take the eggs out..(after about a month)---move her perches around...move the cage if y ou can...12-14 hours night...limit soft warm foods....if none of that works then you may want to visit a vet to ensure she is not getting chronic...