Cockatiel won't stop laying eggs! No mate.

[hopeternal]

[FONT=Micro soft Sans Serif]Tiki, I chose your expert category, as I see in one of your pictures you have many cockatiels! We are concerned about "Suzi's" health, as she keeps laying nest after nest. As soon as she has spent 2-3 weeks on one nest of eggs, she gives up and goes into another nesting mode. She's probably laid a dozen nests-full (5-6 eggs each) in the past year. We are really concerned about what that might be doing to her health. Can you advise? How can we stop her from nesting? She has no mate. Thank you, Cindy (hopeternal).[/FONT]