Dess Was Sent Away Theory:

For the last week I've poured over every pixel of evidence and I have synthesized what I think is the actual truth about Dess.

She's not dead, but instead was sent away.

We know she lived in Hometown and spent her days with her friends and family. We know about all sorts of hobbies she had, including sports.

Obviously not everyone would have liked her and she clearly may have ran into trouble a bunch of times. Her mom of course got really worried about it all, so she decided to send Dess away to live with her relatives elsewhere.

Now we have no direct evidence of what actually transpired next, but I think there's plenty of evidence that supports the notion that as the plane landed, Dess whistled for a cab. The license plate said "Fresh" and it had dice in the mirror.

If anything, she could say that the cab was rare, but thought "Nah, forget it yo Holmes, to Bel-Air!" So she pulled up to a house about seven or eight and yelled to the cabbie "Yo Holmes, smell ya later!" She looked at her kingdom: she was finally there, to sit on her throne as the Prince of Bel-Air.

This theory is compatible with the Dess Goons Theory and the Ralsei is Asriel's "That" Sock theories, but not with the Berdly Joe Biden Sonic theory.