Yes, Dory is actually in the game!
Where Dory Is
- Step 1: Go to the second underwater water coral pillar thing (the orange seaweed one).
- Step 2: Enter the ruins place with the mosaics.
- Step 3: After activating the first 2 fountains, enter the next room and - rather than turning right - swim up and to the left.
- Step 4: Congrats you found Dory!