Those both look like soft shelled or thin shelled eggs to me. New layers sometimes have glitches while their systems figure it all out. Soft shelled eggs can be harder to pass and will sometimes make them feel unwell until they pass it. Whatever you are feeding, it's still a good idea to have the oyster shell available all the time so they can get what they need. The needs can vary with age, time of year, etc, so better that they have access and can take what they need. Hopefully it will resolve as her body figures it all out. If she lays another soft shelled egg then I'd consider giving her a calcium citrate +d once a day for one or two days to see if it helps. It will also help with contractions as well as getting her calcium levels up. But don't do that unless this is a problem that continues. I would give her access to the oyster shell and give her body a little time first.
