As she is still quite young I would say it could be she is still growing and using the calcium for growth as apposed to eggs or she could just not be able to produce enough to make a decent shell.
As said above give them lots of cuttlefish or even natural chalk stone if you can get it.
The other thing you could try is to put some cover over the laying area like branches and lay grass over that she might be pushing the eggs out to quickly as she doesn't feel secure.
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