From what I've read, yes, leopard geckos will eat significantly less during breeding season.
It would be a good idea to get one of those devices, yes.
Glad to hear the news! As long as you have a dish that is deep enough so that the meal worms cannot climb out of it (which would be worth getting if you don't!) you should be fine leaving meal worms in the enclosure for her to eat as she pleases.
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