Oh and one thing that didn’t hit me until now. Make sure the chickens are safe and aren’t being scared or threatened at night. Over excited chickens can lay wacky eggs.
Are the other chickens bullying her to where she can’t get much food? Usually weird eggs have to do with a nutritional deficiency, most commonly a calcium deficiency. What kind of feed are you giving them? Maybe consider throwing in some extra calcium such as crushed oyster shell or dumping...