Antibiotics immediately since at least one egg has broken inside, and that may or may not save her... EYP is luck for them to survive... feathers have nothing to do with calcium levels, feathers are made from pure protein, that's why many recommend withholding extra calcium and upping protein during molt... the feathers will not fix until she molts, they don't repair just get replaced... so she will look rougher before she will look better...
Calcium gluconate is a good calcium supplement if she won't eat oyster shell, I know TSC carries it...
Hope she gets better...