Absolutely. The biggest issue you face is if the shells are weak enough that they start breaking in the nest. That makes a mess to have to clean up. I'd rather cull a bird with such an issue than deal with yucky nest and eggs on a regular basis. Wishing you the best with her. Sounds like she's simply not metabolizing her nutrients well. So, if you give her extra vitamins, it may, or may not help.
Ok. Thanks for your help. It was really befuddling me.