Juana’s treatment of Coyotito’s scorpion sting with a seaweed poultice is described as being “as good a remedy as any.” However, it is still viewed as inferior because it

lacked the doctor’s authority, was simple, and didn’t cost anything.
uses seaweed, which costs a great deal of money.
does nothing to help Coyotito heal from the scorpion sting.
was Juana’s fault Coyotito was stung in the first place.