That was more in order to praise Scrooge, her true idol and father-figure, because if Donald is awesome, then that means that Scrooge is also awesome, because they did awesome things together.
The triplets doubted the story and heroics of Scrooge when they saw a picture of Scrooge and their lame boring cowardly uncle-parent Donald doing something heroic and daring.
I mean, roflcoptermao, that loser who can't hold a job and has a shitty voice is supposed to be one of the most daring adventurer of all time? Fuck off, little autistic girl that lives in the house of an old scottish cheapskate. That's obviously photoshopshit.
And then it turns out that it's actually all true, that Donald Duck can run up walls, his sister cuts off her own leg if needed, their uncle slept with a dime close to his heart that had the body and essence of his archnemesis imprisoned, the nanny is a spy, the butler is now a demon-ghost, and Launchpad will never get hurt when he crashes.
Talk about crazy.