it´s been a while since first egg was laid... almost 15 days... eggs take about 18-21 days to hatch since they were sitted on.. usually when egg #3 is laid or so..

if you could candle them... (get in very dark room place lamp under egg so you can see "through".. this way you can make sure if any are fertile)... by this time you shoul be able to notice baby chicks or not....

if they appear "clear".. then they are definately just yolk, but if you see like half dark half clear it could well be a baby about to hatch

keep her on food... offer her egg... scrambled I´ve found they love...