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You could be waiting months on end since pre-molt takes longer when they get older.
I’d be patient and leave her alone. Make sure the water dish is full, and check for any activity at night using a flashlight.
As long as the temperature in your room stays around 69-75 degrees F you should be fine. Are we talking about vibrations from the AC unit? It shouldn't be a problem unless the enclosure is directly near the unit.
I would recommend adding more substrate to the “Brazilian Blonde” enclosure. When they climb that high, they could easily fall and burst their abdomen. Are you sure that’s a Brazilian Blonde and not an Arizona Blonde?