18 year old Keri McCallen
That she's the youngest, and the ship is brand new don't seem to matter for the story you're describing below. It's also description, thus unnecessary description. Always open a query with action, or a choice the hero needs to make, or what's at stake. In other words something dynamic, not static.
She met a guy on Earth named Chance,
This is unfocused. Does it matter she met him on earth? No. What matters is the forward action: he needs her help and doesn't know why.
Unbeknown to them Keri's mother is involved.
Keri thought her parents died in a horrific aircraft accident on Earth. Now her mother comes back working the puppet strings to bring Keri to their home world Erra, to triumph against the Teagun Empire who's set out to destroy both Erra and Earth for revenge.
This passes unfocused and is now chaotic. Focus ONLY on what is going to happen. Leave out the background (her parents died etc)
Seems there is something special about Keri, her mother is Erron and her father was Teagun. The power of those two races comes together. Now it's Keri's unique existence that can save them all.
You'll want to rethink naming any race "teagun."
Last Chance is a sci-fi mystery containing 52,000 words. This is my debut.
There's not a chance in the world this book is long enough. VERY fast paced high octane crime novels clock in at 55,000 words. Science fiction, and the requisite world building usually start at double that.
I enjoy that this book opens your mind to more possibilities in outer space. If there is intelligent life could some of it have come from Earth millions of years ago? I'd like to think it's a possibility. If they did, what would they be like? I answer those questions and more.
All that may be true, and may be why you wrote the book, but none of it belongs in a query letter. The only thing that belongs in a query is the story.
Thank you for your consideration,
I have a feeling you shouldn't be querying yet. Many writers query too soon, and I have the feeling this is the case here. A good writers group, and critique partners can often help you see places the book needs development. Rather than revise this query, spend some time on the book.
This is a form rejection.