(Set in the late 19th century) To prevent the bank foreclosing on her family estate, a brilliant teenage biologist must travel to Australia to track down her missing parents, but discovers a world full of strange monsters and must create one of her own to survive.

A 19th century biologist, while working in Australia, discovers an area of vicious creatures and must then learn to control one in order to survive.

I suggest the setup is overly complicated, unnecessarily so.? Why waste time and pages about the business of the bank?? Why not just cut to the chase ASAP? The inciting incident is that her parents have stopped communicating. No telegram or letter for months.? To her or anyone else. She must find out what happened to them.? And pack her off to the Down Under.

Whatever, the hook of the story is her fabricating her own hybrid sidekick. Frankly, all the yada yada about finding her parents can't compare to it, may actually derail interest in your intended plot line.

What I don't see is how it fits in "horror" story.? The "monster" seems her ally -- not her antagonist.? Horror stories require a designated antagonist.? Who is hers?? No antagonist is designated in your logline.? A world full of strange monsters" doesn't fit the bill.? Too general and too many,? The logline doesn't? tell us who/what constitutes her singular, horrible threat, the entity that is out to kill her specifically.

Finally, genres have rules, expectations.? One of the rules of the horror genre is that the exercise of god-like powers? always has unintended and undesirable?consequences.? It's an exercise in hubris, a violation of the natural order, and those who do so must pay for it. Dearly and (usually) finally with their lives.?

Unquestionably, the teenage prodigy is exercising god-like powers, is violating the natural order in creating hybrid species by mere caprice . So, by the conventional rules of the horror genre, the teen prodigy has to be too smart for her own good. Sh*t happens, must happen as a result of her fooling around, her hubris.? ?She's gotta pay a terrible price for "messing with animals".?

I don't see (yet)? how how her story fits the requirements of the genre.

Just saying.

As a side thought, if you changed "must create" a monster, to she "must become" a monster, imagine how much more of a character arc your story has just from that tiny change.