Sentence pattern
Solution 1:
In a comment BillJ wrote:
The PP "to her elders" is Complement of the adjective "obedient". The AdjP "obedient to her elders" then functions as predicative complement of "be" in its ascriptive sense.
In a comment BillJ wrote:
The PP "to her elders" is Complement of the adjective "obedient". The AdjP "obedient to her elders" then functions as predicative complement of "be" in its ascriptive sense.