|As a story, this one doesn't really feel complete. As an introduction to a series of stories or a book, this has tremendous potential. I don't think you can introduce such an original invention as interdimensional boots without doing something with it; readers want a story! To say that she travelled the universe is not sufficient. What adventures did she have? That's what really counts.
So I applaud the concept but encourage you to write the stories. You may have already done so but there's no indication of this one the page I'm looking at. And so, to style.
You have a tendency to deliver too much information too quickly. Your sentences often contain more than comfortably fits inside them, they begin to bulge and split their seams. I suffer from the same problem - I want the reader to know everything, to understand exactly what I'm talking about. But we run the risk of burying our audience's interest beneath the weight of facts. Slow it down a bit by breaking long sentences into shorter ones. Give little presents of the occasional tiny sentence for the reader to take a breath. Like this, for instance.
Take a long look at this sentence: "Though, she could recognize when objects did things they weren't typically expected to do, like the fact that her father's old, ratty, mismatched laced, boots were capable of carrying a person across dimensions rather than just the average back and forth across flat and rocky ground like average boots." It's a very lengthy way of telling the readers something they already know - that boots are for walking, not for zipping between dimensions. And beware repetition - "average" is fine once but use something like "ordinary" the second time.
Avoid discussions with yourself - decide what you want to say before you start writing. Here's an example: "Dominica's father had been a strange man, or so she'd been told, repeatedly. It wasn't like she'd ever noticed that about him though, but then again, people said the same thing about her, a lot." Better would be, "People said her father was a strange man. Her own reputation was similar." Let the reader decide whether she's strange - it draws them into the story by giving them something to do.
Try to avoid trendy clichés like "slapping someone upside the head." It may sound cool the first time your hear it but much cooler is to invent it yourself. Let others admire your way with words rather than give the impression you're trying to be "in."
The thing is, these are minor flaws in what otherwise is a very competent writing style for your age. If you sort them out, you'll be ahead of your contemporaries. You have very few grammatical or technical errors and it's quite clear that you know how to spin a yarn. Just be a little more restrained in your attack and you'll wow the editors.
As I've said before, it's a fantastic idea - now do something with it!