Well it would certainly appear her gender is confirmed!
Is Gizmo showing any interest in incubating that egg at all? When my Lilly the purple crown was laying, she was intensely interested in her egg straight away, and would lay another about every day and a half to two days. I did get her a dummy egg, it was a roughly egg-shaped piece of snowy quartz which was the best approximation in size and weight that I could get for her, since she would not be fooled by a fake budgie's egg. I think it's easier to find dummy eggs in a size to suit a rainbow lorikeet though. Lilly would lay two or three eggs in a clutch, but be perfectly happy to just sit on the one. In Gizmo's case it may be a "one and done", but she may well have another forming. When Lilly started laying infertile eggs I took her to my vet for an exam and advice - I don't know if you have an avian vet that you see already, but the following list may help you find one if you don't ...........
After a suggestion by a member, @Abu Colo, the Mod Team decided to create a list of veterinarians around the world who see birds. This was something we had discussed a few years ago, but the task seemed so large that we didn't get very far. However, the need is there and we decided that the time...
www.parrotforums.com
You are wise to be concerned, as egg laying can result in some serious health issues. I do not wish to alarm you, but it was a combination of such issues that resulted in me losing my little Lilly, so I would keep a very close eye on your hen and get some professional advice if you possibly can.
I wish you and your girl all the very best of luck.

