It won't matter for anything. While large spots are disfavored under the standard, they aren't a serious fault. While a lot of people don't like them, other people do, and it's no matter either way for SchH or anything else.
They also don't tend to get larger once they sort of set themselves as the adult coat comes in, and may get a bit smaller.
She looks amazing. Faulty or not I doubt her color would keep her from being an amazing dog and companion. Faulty colored dogs can do a plethora of things. Unless you want to go into a glamour-shots aesthetics focused type show ring, that spot is the last thing you need to worry about. I hope you can get her! I think it gives her great personality!