If this is a younger female or her first year breeding it's probable that the eggs laid were infertile. That is very common. You can usually tell when they are laid if they are a nice white color and soft but firm feeling. If they are very yellow or squishy odds are infertile.

You can take a small flashlight and candle the eggs looking for veins and red spots. If the egg is hollow more then likely it's infertile, but not always.

If the eggs dented, then molded I am guessing from that alone it's infertile.

The GEO is fine if you are looking for that type of incubation process. I personally just use perlite and plastic containers. Here is an article we wrote about it to help people out:

How To Incubate Leopard Gecko Eggs

Example of fertile eggs:


Hope that helps GL!