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Has she really abandoned them or is she still assembling a clutch? Had you seen her sitting on the eggs through the night and all day?
A heat pad won't do the job.
Same temperature as chickens. Most birds incubate at 99-100F.
Above 104F internal egg temperature will kill embryos in nearly any species egg, except perhaps mound builders like crocodilians.
She laid 8 eggs in the shade a few days ago and I haven’t seen her checking on them or warming them since then. The location she chose was dropping into the low 80’s. I have taken them inside and put them inside a towel on a heating pad. Yesterday the max temperature achieved was 104. It shuts off intermittently and the temperature drops into the 90’s. This is definitely an experiment in progress.
If she was laying them in a clutch she was going to come back and sit once she was done laying. Peahens can go three days between laying eggs so she might have been about done and getting ready to go broody. I think you made a mistake by removing the eggs especially since you do not have a proper incubator or a broody hen to put them under. A heating pad is sure to ruin the eggs.