they hatch out normally at about 8 or 9 months but I have read on here that some have taken as long as 13-15 months. Read JannB's egg laying blog. It will tell you what to do. I know they need extra calcium after laying.
Make sure u up her calcium intake and plenty of food and water after laying. They can hatch anywhere as early as 6 months, but as carol said usually around 8 or 9 months. I just had one clutch that hatched out in 7 months and another clutch that is starting to hatch out now and it's about 6.5 to 7 months for that one.
i give mine some hornworms, extra water and a shower (the water i give has repashy calcium that dissolves in water) and ofcourse extra dustings on any feeders