Meaning: This sentence expresses that the subject experienced a sense of great pleasure or happiness when participating in the activity of immersing herself in mud.
Choice of Words: "She" refers to a feminine subject, "found" indicates discovery or attainment, "joy" is a feeling of great pleasure or happiness, "in" signifies a particular context or situation, and "mud baths" are a type of therapy or leisure activity involving submerging oneself in mud.