I'm not sure that is what Tomino had in mind for the character at all.
Quess is there to show the dangers of being over-emotional, which is a re-occuring trend throughout Tomino's UC works (on both sides of the gender fence as well, not just women (take Katz or Jerid for example). Tomino is very careful to point out that people should embrace their emotions (after all, Newtypes are ALL about feeling, right?), but they shouldn't be ruled by them. A person should acknowledge how they feel, but keep themselves in check by staying logical. If you notice, the key to surviving UC Gundam is to maintain a cool head.
Furthermore, Quess is also there to demonstrate the dangers of hero worship. The people she tries to cling to in the story are both deeply flawed troubled men. Neither Amuro nor Char really care for her, though Char isn't above pretending to like her so he could manipulate her, leading to her death. It's a statement on the nature of "heroes" and "leadership" in general.