How big was this cricket and how big is your gecko? If the gecko ate the cricket it should be fine. Maybe it is still full. Has it deficated since eating the cricket?
It pooped today so should it be fine. My leopard gecko is about 8 inches long. The cricket in width was just a little wider than my leopard gecko eyes to eyes. I also went to the petstore yesterday asking for small. They gave me a little bigger then pinheads. I tried if my leopard gecko will eat them. He just ignored it. When they are big would they eat small crickets?
I'm sure the cricket size was probably fine, it just takes a lot more little crickets to fill them up than a few appropriately sized ones. She was probably just full.
The first week I got my leo, he ate 3 mealworms everyday. Nowadays, he eats 8~9 mealworms every other day, so I guess it is normal if his meal schedule changes
Are you still using the little crix? I have one leo that won't fool with a little one unless he is real hungry and one that doesn't care what size they are as long as they move.