Sounds like perhaps she wasn't cooled long enough, or low enough or a combination of both. I personally take my burms down to 80 degree lows and 84-85 highs for a minimum of 8 weeks before bringing them up for breeding.
To find out if your 9 big eggs are fertile turn off all the kights and place a flashlight against the top of the egg right up against the "skin". This is called "candling". If they are fertile they will have many red veins running through them that are very visible.
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