All the below are just off the top of a caffeine starved morning head.
How large is her cage? (a photo would be good) Too small she could be seeing the whole thing as a nest. Change it all around, make it unfamiliar to her. Do this every week.
How dark is dark? How quiet is quiet?
Reducing contact is good and distraction is a great tool. As mentioned previously training is a great aid, but having plenty to do outside of the cage will take her mind off these things.
UV-B light is not effective. Better to have a bright led light over the cage on a timer, on for the whole daytime period.
Bedrooms are busy at night. Just turning over in bed can disturb a bird's natural sleep cycle. Snoring is scary.
Consider a female friend for her. Just having another bird in the cage will make it an unsuitable as a "nest" and no fertile eggs. However if the cage is too small that may cause problems between any two birds.
Take her to an avian vet, there may be an underlying health problem triggering this. (last resort) Mention lupron while you're there.
Here's some coffee for you!
Well, I'm devastated. She just had number 9. (I'm not losing count am I?) She was 34g this morning and I was so excited - maybe no more eggs! No, in fact it means she is losing weight. I've messaged a friend to see if she can come to me to the new exotic / avian vet I've found. I'm disabled so it helps to have support.
Anyway, the day before yesterday I took your advice and changed around everything in her cage. It reminded me I had this long rope perch I had never used, so put that in. Moved the positions of everything else too.
She is currently sleeping in the spare room. Her cover keeps things very dark, but the curtains in the room are not blackout ones.
She has dummy eggs now as taking them out wasn't working. I've replaced the ones she laid, plus gave her enough for a full clutch of 8. Well, 9 now.
Here is her cage (before the perch change around). I know it will be considered small for people in western countries.... 370x415x545mm
The top play gym and light is not always there. She is out for almost two hours in the morning and two to three hours in the afternoon.
It's Marine Day here in Japan (public holiday) so hubs was here to see her lay her 9th. He seems to be warming to the idea of another friend. *If* we do, I have ideas of getting another cage and stand like this, as you can't guarantee they'll get along can you?