Hello, and welcome to Just Answer. I certainly understand your concern for Holly, but there is really no need to worry. The amount of petroleum distillates that it takes to kill a wasp is low, and will have dissipated a bit over the following 5 days.
It is very unlikely that there would be enough of the spray still present to cause her any severe problems.
Could there not likely be any poison left on the wasp at this time? She only weighs 16 lbs!
There is not likely enough poison to cause Holly any harm. I certainly understand your concern. It is possible to see a bit of upset stomach as a result of simply ingesting the wasp, about the only thing you could do is to give her a teaspoon of Pepto Bismol to help prevent the upset stomach, but you do not need to fear her being poisoned.