Answer:
A veterinarian
Step-by-step explanation:
I think Melanie is a veterinarian because...
1. The patient "Bill", has 4 legs in total, meaning it's not human. It's probably a dog or a cat.
2. She checks both skin and eyes meaning she is not only an eye doctor or skin doctor. She is probably a veterinarian because veterinarians check both skin and eyes of pets.
3. Bill probably didn't answer her question because it's an animal and animals can't speak our language.
Hope this helped! :)