When this happened to me I'd just feed multiple items if the animal would take them. If it wouldn't id make sure that animal got the "right" size and give someone else a few at a time. A snake doesn't care if it eats 5 rodents or 1 as long as its full.

With ball pythons, for the most part, if they are eating, I'm feeding. If a snake wants 2-3 hoppers, it gets 2 or 3 hoppers. If it wants 1, it gets one. As they grow to adults they get a lot more consistent in their eating.