A year old is too young for a corn snake to breed, the male may be up for it but the female may not be able to reproduce. It usually takes about 2 months for them to lay eggs after mating so it should be slightly noticable if she's gravid after a month or so. You could try feeling for eggs (letting her slither across your hand and see if you can feel a row of bumps).

If she is gravid she will also become a lot more active, trying to escape her enclosure when she's nearing the time to lay her eggs, at which point you will want to provide her a nesting box if you havn't already done so.

Aspen wouldn't make a very good medium for incubating eggs, vermiculite or sphagnum moss would be much more suitable. The eggs will need to be burried partially in the substrate you're incubating them in. The eggs will change in accordance to humidity, if theres too little they will dimple in, in which case you will need to create more humidity by adding more water (warm water) to the substrate, though if it's just a single egg that's struggling, a trick is to place a damp tissue over it like a little wet blanket. If the humidity is too high the eggs will swell and become hard, the humidity will need to be lowered by exposing them to the air i.e so they are not burried. The lid to the incubator can also be opened slightly allowing moisture to escape.

If the eggs start to grow mould on them, clean the egg daily with a damp tissue.

25-29C or 80-85F are good temps for incubating the eggs at, it takes approx 60-80 days for them to hatch and may take up to 3 days for them to fully hatch out after the first pip.

Hope that helps!

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