Doesn't matter either way.
Keep in mind that (As far as i am aware) this is merely a rough guideline and not the indication of any actual set-in-stone character sheet, further in most standard games you don't receive any bonuses for being one-quarter something, so assuming Lexi does get some bonuses/penalties for it, it would both be very miniscule and entirely homebrewed, given only because Coffee thinks it's significant enough for warrant it. (For example being 1/4 hobgoblin could probably be worth a +1 Dex bonus, but being 1/4 Elf is probably too human to really be worth anything special.)