I actually don't think her HF career will be affected. I mean, even though her career is amazing, when you look at the kind of job she books, it is kind of limited. And I don't say that in a bad way at all, but we just don't see her doing Prada or Louis Vuitton, for example. I don't see her missing a Versace show for VS, since they are filled with VS models and instamodels. Same for Moschino or Balmain.
But I think the main reason why she may want to be an angel (as opposed to models like Luna, for example, who is more or less on her level and would have been on VS' radar years ago because of her look) is that she is American. It's more of a dream for people who have actually been exposed to the show since they were kids.