This is my prediction on how Della might try to get in contact with her family in hopes of reuniting with them:
The nephews have a mock battle in the living room over what to watch on TV at McDuck manor. Huey wants to watch Darkwing Duck, Dewey wants a spaghetti western, and Louie possibly wants to watch an anime. While Webby is insisting on the family each getting different tvs for their bedrooms, the tv goes on the fritz suddenly.
While Huey is angry expecting a beatdown from Donald, Dewey spots something on the tv. The kids spot Della on the Spear of Selene cockpit. HDL have a chat with Della over all things that happened since she was gone, and now Della wants to fix her mistakes and try to reunite with her family. With the connection about to cut off, Della says to her kids she will try to find something, something in the moon to hopefully repair the Spear of Selene and make her way home.