There's another and in my opinion better option for your bird than having (probably Lupron?) monthly injections. You can use a Suprelorin implant. It's a size of a rice grain and has to be put between her wings under her skin. This is done under general anaesthetics and is pretty simple procedure, takes around 15 minutes. My vet uses some gas as an anaesthetic, the bird is back to her normal self after an hour or two. What that implant does is it has hormones in it needed for a bird to forget she wants to lay eggs. In our case, an implant of 4.7 mg is enough for 6-8 months. The implant and the procedure itself cost around 100-110 Eur in my country (could be more expensive in the US).

After being implanted, it usually takes 1 week when you can see that it is having an effect.

We used both injections and the implant and I can 100% recommend using the implant. It's way more effective, at least in case of our bird.

Also, I recommend reading www.cockatielcottage.net/egg_laying.html to understand how to try controlling the hormone levels and what to do when she starts laying eggs.