Hi Dennis,
I don't think leos will become uninterested in crickets after tasting mealworms because they like more active foods. But, there are the certain few leos that are picky about what they eat and prefer certain foods over others. In this case, I think your leo decided that she prefers mealies over crickets. You can still try giving your leo a variety of foods, but if she really doesn't like crickets, you can try mealies and superworms. Mealies are an excellent staple diet for your leo and can eat 10-15 per sitting. So, since she ate only a couple mealies and hasn't eaten since, she's probably hungry
You can try leaving some mealies and crickets in together and see which one she goes for- and if it's mealies only, you might want to feed her more mealies so she doesn't lose weight- also, you can try switching her back to crickets if you prefer them better. It may be tough, but I wish you luck on it
The only worms you don't want to overfeed your leo are waxworms. Those should only be given once a week to prevent addiction and refusal of other foods. But, if you decide to switch to mealies - don't worry about it being bad for them because it's a good staple diet
I use them to feed my leo 
[aimEe]
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0.1.0 Albino Leopard Gecko (Marlene)
0.0.2 Fire Bellied Toads (Norman & Forman)
0.2.0 African Dwarf Frogs (Hobo & Bobo)
1.0.0 Fighting Fish (Blue Balls)
0.0.2 Hermit Crabs (Kirby & Furby)
1.0.0 Black Lab / Pit Bull (Mikey)
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