She falls into working with Uncle Alzaaro in magical research for a few years, which she isn't overly enthused about, but can live with doing.  She follows him to a few international conventions, blows up a few boring presentations, and eventually catches the eye of a recruiter for a warlord of desert clan.

This warlord has heard a whole lot about nuclear weapons, and he's become obsessed with them.  Along with two extremely-well-paid nuclear scientists from our world, he hires X to design the ultimate secret weapon: a doomsday device that can be controlled magically.

X is fascinated by the project, and she works hard on it at first.  But, eventually, it occurs to her that this is meant to kill actual people.  Despite her previous dedication, she walks in the next day and sabotages the project, destroys the notes, blows up the warlord's bribing-money, and tricks the other people working on the secret project into a trap by the United Nations.  Ruined and with two worlds' outrage aimed at him, the warlord is quickly crushed by his enemies.  For generations afterwards, people use the phrase "to hire X" to describe choosing an ally or employee foolishly.

Daria works with her to invent quite a few things, most of which are bizarre in the extreme, but a few are so ingenious that they become household names.  X happily makes her fortune, ignores it, and keeps on acting as a patron to Aylia's library whenever Aylia shows up and wheedles more book-money out of her.  She spends most of her time in the mountains, near Daria, where most people cannot find her to pester her.  This works out well, given that most countries don't want her near them either -- except Dragoria, which keeps mounting invasions to capture her.  X and Daria make a game out of trouncing them soundly.

She eventually allows Aylia's younger son to apprentice to her, letting him infer her secrets and pretending he's not there unless she needs a second pair of hands to hold something.  She never marries or has children herself, but she never feels like she's missing anything because of this.