About a week ago, Daisy started giving this adorable little cheeping call, and raising her tail. Then two days ago, I found her on the bottom of the cage, and she had piled all her Lego blocks up, and was sitting on them. She was also very defensive of them.
Then last night I saw her straining, and wiggling, and heard a soft "clunk". She's started laying a clutch of eggs! I've got her on calcium. I know the egg(s) (and the Legos) are infertile, because she has no mate, so I'm just going to let her brood them until she's satisfied there are no babies coming.
Sweet girl! She's being a good mommy, keeping her egg and her Legos safe.