
Her big, beautiful, tawny eyes roamed the scenery outside her glass frame, taking in every detail.
Since this is written from her perspective, it doesn't quite work for her to describe her own eyes in this kind of detail. Realistically, one wouldn't think of their own features like this.

It got dark quick in the evening, night fell early and swiftly.
The sentence before the comma is an independent clause, meaning it can stand alone, and the sentence after the comma is also an independent clause. In order to eliminate the comma splice, you need to either separate the two sentences with a semicolon or full stop, or provide a coordinating conjunction after the comma such as and. Here's an awesome link just in case I confused the situation with my explanation.
The Comma Splice

. . . in small burst of artificial daylight.
I think the word burst should be plural.

I noticed a lack of commas in introductory phrases. Here are a couple of examples with the commas added in.
~ After an exhausting day of school and a lost basketball game(,) she was more than ready to fling herself onto her warm cozy bed.
~ With each flash(,) Amber saw the woods light up around her.

This belongs in a horror movie. She thought.
Direct internal thoughts work the same as dialogue, so the dialogue tag, she thought should be an addition to the sentence. Consider: This belongs in a horror movie, she thought.

In burst of the flashing light Amber caught a swift glance at the street sign: Vixen Hollow.
The wording here is a little bit awkward for me. Also, you used burst to describe the light in the previous paragraph, so it felt a little bit repetitive. Consider: In the glow caused by the flashing light(,) Amber caught a swift glance . . .

She stopped dead in her tracks and studied the boy, looking for anyone she recognized from school.
The last part, looking for anyone she recognized from school, made me think she looked around to see if she could see any familiar faces, but I think what you meant was for her to be wondering if she could place him as someone she'd seen at school before. Consider rephrasing to eliminate confusion.

I noticed a lack of commas before conjunctions in compound sentences. A compound sentence is a sentence that contains two independent clauses that are joined by a conjunction such as for, and, nor, but, or, yet, and so. In order to make the sentence proper, a comma should be placed directly before the conjunction. Here are a couple of examples for you with the commas added in.
~ Her stop was the furthest from town(,) and she was always the last one off.
~ Most of his face was covered in shadows from a low hanging hat(,) but Amber could still tell she had never seen him before.

“Sorry John, I’ll be right up.” Replied Amber.
Consider a comma before John because it is a direct address. Also, since replied Amber is a dialogue tag, the period at the end of the dialogue should be a comma, and the dialogue tag should start in lower case. For example, "Sorry, John. I'll be right up," replied Amber. This issue is repeated several times throughout the story.

He saw Amber moving away and labeled her the reason of his agony.
Consider using for instead of of for a smoother flow.

She spun it around in her and after studying it for several moments . . .
I think you're missing the word hand after in her.

He didn’t get a reply as the girl slowly ambled down the walkway.
Since the perspective of the narrative is Amber's, this doesn't work because she wouldn't think 'the girl.' Consider, He didn't get a reply as she slowly ambled . . .