My mental tongue keeps tripping on:

a sheltered creator

I don't know why, and it may not need fixing, just thought I'd mention it.

I like it, by the way. This last version is nice and tight.

To save all she knows, Aimee must sacrifice everything she loves.

Is there a different phrasing for this? It's got good sound and rhythm, but it feels like I've seen it in a lot of places.

Thanks. A few more things to weigh, but it sounds like I'm close, just tweaking the phrasing now.

And when you tweak, Ricky Nelson lyric to keep in mind:

"But it's all right now, I learned my lesson well. You see, ya can't please everyone, so ya got to please yourself."

Okay, I'm going to make an attempt at query lettering:

Defenders of the Crown is the story of Leah Archer, who doesn’t wish she was secretly a fairy princess. Really, she doesn’t. Sure, she reads an awful lot of fantasy, and sometimes she think it would be nice to have the sort of adventure she reads about. She’s old enough, though, to know that things like that don’t happen in real life.

But when Leah, her kid sister, and her friends perform an accidental spell that summons an unconscious man in a golden crown to Leah’s suburban living room, she finds that the sort of adventure you read about isn’t much fun at all when it’s happening to you. On the bright side, she’s still not a fairy princess-- but it turns out that her little sister, Leslie, is. Which is totally unfair, if you ask Leah.

Leah and her sister meet selkies and dryads, travel underground with goblins, and see what’s become of a kingdom trapped in a ten-year winter. All the while, Leah has to come to terms with *not* being the magical one. And she’d better do it fast, because she’s got to take on the Winter Court.

I got a really nice e-mail from a reader, that's a pleasant surprise.

I like the way you catch the tone of the story, but I'm not entirely sure what Leah is trying to accomplish.

sort of adventure you read about

This bit is in both the first and second paragraph, one of them should probably be rephrased.

She’s old enough, though, to know that things like that don’t happen in real life.

This could probably be shortened. Also, you might want to mention how old she is. It sounds like she's a kid or at least a teenager so her actual age could be important for indicating the target audience.

But when Leah, her kid sister, and her friends perform an accidental spell that summons an unconscious man in a golden crown

Maybe this could be tightened: But when Leah, her kid sister, and her friends accidentally summon an unconscious man in a golden crown...

she’s still not a fairy princess-- but it turns out that her little sister, Leslie, is

Not sure about the m-dash here used with a conjunction. It's not necessary and you aren't really interrupting your thought.

Okay, I think this is a slightly smoother version, and it explains a little bit more about the plot.

Defenders of the Crown is the story of Leah Archer, who doesn’t wish she was secretly a fairy princess. Really, she doesn’t. Sure, she reads an awful lot of fantasy, and sometimes she think it would be nice to have the sort of adventure she reads about, but she’s old enough to know things like that don’t happen in real life.

Then Leah, her kid sister, and her friends perform an accidental spell that summons an unconscious man in a golden crown to Leah’s suburban living room. She soon finds that the sort of adventure you read about isn’t much fun at all when it’s happening to you. Especially because Leah's little sister is the one who turns out to be the secret fairy princess, and she doesn't even want the job.

When one of their friends is kidnapped, Leah and her sister must go after her. They meet selkies and dryads, travel underground with goblins, and see what’s become of a kingdom trapped in a ten-year winter. All the while, Leah has to come to terms with *not* being the magical one. And she’d better do it fast, because she’s got to take on the Winter Court.

I think that's much smoother, Holli, and it still gives a sense of your voice and the tone. I would cut the "Really, she doesn't," though. It's just one little touch too much there.

Is this a middle-grade novel? Slightly younger than YA? It's reading that way to me here, but I wasn't sure.