Final answer:
A client with shingles affecting her entire torso is most likely to be experiencing diffuse pain.
Step-by-step explanation:
The medical client most likely to be experiencing diffuse pain is A client with shingles affecting her entire torso. Shingles is caused by the varicella-zoster virus and typically presents with a rash and pain along a specific nerve pathway. In this case, the rash and pain are affecting the entire torso, leading to diffuse pain.