I did not provide a nesting box for my budgies as I thought they would not mate unless they had one. The hen laid an egg in a shallow dish on the cage floor used for treats.We put up a nesting box and placed the egg inside but the hen would not go into it.We did not know what to do so replaced egg in shallow dish and the hen has laid more eggs.Can anyone advise us what to do.The male is feeding and looking after her.Please help.