Nicole McKeon is definitely a human. A regular human who eats food, and sleeps, and likes dogs. Like all regular humans. She is certainly not a fae creature masquerading as a person. Those don’t exist. Who told you that?
Her books will NOT suck you out of your world and leave you stranded in precarious situations with magical characters so she can absorb your energy and increase her power. People will say anything these days. Just read one of her books. You’ll be fine. I’m sure. You can trust me.