Dorothy supports herself and what she believes to be good for everyone else from her point of view. Let's just put it that way.
I mean she wanted the ultimate war to bring the world to its senses after she lost her father.
In Battlefield of Pacifists, she's openly disappointed about Heero and Relena's reunion not being "passionate" so one can at least say she's perceptive about those two. Strikes me as the sort of person who get up in other people's business a lot. Just look at her appearance in EW Special Edition.