YW!
They are probably molding with the moss because they are bad eggs, but you are right if the moss is too wet and she lays them and they are not removed fairly quickly even good eggs go bad.. but it sounds like to me she was just a "bad" first year breeder. It happens often no matter what you do.
No matter what your substrate is if it's too wet they will mold. Using vermiculite is fine. Many people use that for both egg laying and moist hide. I personally prefer perilite for incubation and moss for laying/humidity box. It works very well for me and my setup.
Next year should def be better! Keep her calcium up and lots of proteins and vitamins and she should be good to go. The good news for you is she did lay a good amount of eggs, so once she get's it right you should have plenty of lil baby geckos running around (:
Photo of our old setup with egg laying box (not an actual female but our egg laying boxes were identical last year - this is just a humid hide with the top off) We have upgraded to larger setups for this year.
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