Normally in the Minikit Guide, as an exeption here as standalone.
Dana can be found in the RMS Unsinkable and is trapped. Water the plant in the past to free her.
What you need to free her:
DeLorean (Vehicle) from the Back to the Future Level Pack.
Water Spray Ability: In my case, I upgraded the Mystery Machine from Shaggy (Scooby Doo) to Level 2.