Keep petting spike and feeding her treats try to start teaching her the up(having her step up on your finger)maybe in a week or so go slow female tiels will sometimes lay eggs even when they have no mate,let them sit on the eggs for a week or so before takeing them away,they need a male to have eggs that will hatch into chicks,they can't be hatchable eggs inless she has a male to breed with which i don't think you want to do.Like i said birdtalkmagazine.com has good info and so does the magazine itself Cockatiels for dummies is a great book you can probable get it at a libery or pet store like petco