#Although they admit that Dani makes for a cool crowned knighted heroic princess though they'll take her

[madametamma]

What if after Danielle is stabilized, she goes to the ghost zone where through a series of adventures, she discovers that she is the ghost zone princess because Danny is the king by right of conquest.  She is technically next in line to inherit the throne, provided that Danny is not overthrown also by conquest/ has no offspring of his own that come of age. 

She goes through this amazing journey, first discovering the truth, then growing to understand what kind of princess she wants to be, and amassing a following of ghostly subjects after committing dangerous and grand feats of heroism that help her people and inspire them.

When she meets up with Danny again, much later, she’s become this elegant, shining armored, warrior princess, and Danny....

Had no clue he was king this whole time.  No one told him. This is how he found out.