Kale and spinach contain calcium blockers (oxalates), it's fine in small amounts, once a week but too much blocks the bodies ability to absorb calcium, which causes laying issues.
Is she standing funny?
Are you able to get chicken feed, not scratch? If possible, I'd cut back or cut out the corn and rice, neither help her.
Vitamin E also, you can get any brand from the grocery or drug store.
What's your birds diet?
You can try vitamin therapy, I'd it isn't a toxin or a severe neurologist event, it might help.
400i.u vitamin e capsule and a third of a B complex tablet every day for a few weeks.
There was someone who did this a few weeks ago.
The shape of egg thing is a old wives tale. What the egg is, is actually what we call the yolk, the shape of the shell that encapsulates the yolk has everything to do with to state of the individual hens reproductive tract and none with the gender...
I'd honestly return it if you haven't opened it, it likely won't hurt them but 17% is a little low. Mealworms won't do much to boost protein but tuna or meat will.
Unfortunately, this is why any new birds must be completely quarantined from an existing flock for a month.
There's no telling what/if she has anything to pass to the others.
Ok, moving on. It could be coincidence, so what type of symptoms are you seeing?
What is their diet?
Have your birds...