Hi there, welcome to BYC!
You already hit most clues head on..
daylight, not prolific (every other day is norm for blue eggs)
genetics.
Beyond hidden nest or egg thieves.. if nothing else has changed then it does NOT sound like cause for concern as described. Egg binding is usually fatal inside of 48 hours and does not allow for normal type behavior due to discomfort and toxicity. Without passing waste they also cannot take in feed for energy.
Internal laying or other reproductive disorder IS possible but that's not what this breed is known for and not truly what I suspect.
Sometimes they will have mini molts.. just enough to stop production but not enough to look like a pillow exploded or actually see bald spots and not dependent upon age as far as I can tell but perhaps a multiplicity of reasons, mostly genetic and influenced by many factors. Sometimes you can find pin feathers with inspection.
Parasites can impact production SOME.. usually by less than 10% which would be negligible and rarely noticed by home keepers. Inspection monthly is always a good idea.. and preferably after dark using a flashlight as that's the easiest way to see things including some that don;t live on the bird but come out to feed on them at roost.
Funny on me.. I didn't see chick IA nado.. chick eee uh nah doe.. like aficionado.. clever.
I saw chick NADO.. chick nay doe,, like sharknado!
And uhm I'm so good at chicken math.. it felt like a weather prediction.. that I think already took place at my house!
If your ladies behavior changes to things like.. not eating or drinking, not leaving the nest box, or hunched stance with tail pumping, not accepting favorite treats, staying on roost in daytime.. anything that seems off compared to normal.. then quick action is key, starting with checking crop function. It's good to stay aware of things though and egg laying is one of those things that can be a key indicator.. one reasons why I keep track of who lays, how often, where, etc.. and one reason why O love having different colored eggs. Sounds like you're on top of it, so keep up the good eye and never be afraid to ask!
