Actually, don't worry too much about the heat---she will have put the eggs in the spot in her tub she thinks is best for incubating. She can do the incubating for you for 24 hours while you heat up the incubator. You might throw a wet washcloth on the opposite end of the tub to boost the humidity---low humidity is much more dangerous to those eggs than low temps.
It won't hurt to wait an extra day. Plenty of breeders don't catch the eggs until the day after. And plenty of people do maternal incubation with great results. But if you live in a dry place (like me), the low humidity is an issue.
I think the water + egg crate is a good stop-gap solution. I'd use two pieces of egg crate, stacked, to keep the eggs well away from the water.
2nd white egg is likely a roll-out. Sometimes mom knows something you don't, and it turns out to be a weaker egg. And sometimes it's just a mistake on her part, and the egg hatches normally. If she doesn't coil around it later tonight, you might remove her, remove the slug and tuck that egg back in with the others, and then let her go back and coil the whole bunch.
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