I was doing some research and your budgie may be older if it is a dark eyed clear mutation. It could also be a double factor spangle. I'm not well versed in budgie genetics and how they work so I can't say for sure which mutation it is.
https://www.budgie-bubble.co.uk/ino-mutation
OK, I kind of skimmed over that, so I might have missed something, but if she isn't a lutino (and obviously not an albino) wouldn't that mean that the cere would have the "mature" colour, or does that colour mutation also affect that? It doesn't look like an adult female cere to me (both out of breeding season and in), and it's certainly not an adult male cere