By the time energy from the sun has reached snappy and the food she eats how much of that original energy is still available to her

There is one one-billionth of the original energy emitted available to her.

Explanation:

Energy released from the sun has to travel through space to reach anappy.

In the course of travelling, about thirty four percent of the energy is reflected back to space by clouds.

The earth then reflects back the remaining.

Reflection from the earth includes snappy's and the food she is eating reflection.