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Hey there, I'll give you a review.

It feels like hours that she’s been running from him full pelt through the forest and she still hasn’t caught a glimpse of whoever he is

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'that' doesn't quite sound right, perhaps It felt like it had been hours

You see them too,” she breathed, watching him watch the tail of the Shadow disappear. “You see the Shadows.”

a bit of a mouthfull, perhaps you could change it to 'watching him view'.

But Jakob saw one too, so now they’d have to believe her.

Doesn't quite sound write. Perhaps had seen one too.

"Jake saw it,”

Only a few minor grammer corrections there. I really like the opening to your story, the characters are well presented, and the plot moves along well. I'm looking forward to finding out about who Luke is, and the mysterious shadows.
Good work, I'll definatley be following.