My Parakeets Laying eggs?

She Laid two or three a while back but didn't take care of them at all and now shes laid 3 more (one got cracked so we had to throw it away) We don't have a nesting box but we put this little plastic dish thing in the cage and shes been going in there and sitting on them she laid a another one today in it and she does Pretty much just sits on them all day ecxept when shes hungry or thirsty.I don't really know what to do. Could somebody please tell me everything i need to know? Thank you and Sorry If i spelled anything wrong or Just Kinda babbled on about things.