Curved horn - pass
The loosely painted seemed to apply to the horn, since after the comma was a modifier for the curved horn. Matching a terror of a child's empty nightmare seemed vaguely a youth reference, but was more pointed directly to the horn. Empty nightmare could have been white, like a ghost. I think that there were too many words here to pinpoint exactly what this clue was going for, and since it modified the horn in the sentence, I would fail this set of clues.
Destruction of lives - matter of opinion since Zima is not a member of the Plague. She only lives in the Basin. So, I would fail this one.
Thick headed and stubborn - check, pass.
The way the sentences was shaped made me think that the character who was being sought was a womanizer. Since this filly is two years old, I would not apply wench to her right away. The shape of the sentence seemed to apply to a point of view, not to the character itself. Trustworthy is directly from the profile, but saying that that trust would fly away would be speculation, to me. I neither pass nor fail this because there are good pieces here, but I think that the execution is misleading, personally.
I somewhat got the reference to the Basin, but this seemed misleading. A fake reality could apply to illusion magic and did not apply directly to the character. I would say that this fluff is more misleading than just innocent fluff.
Overall, I think I have to fail this stealth.
There are some really good pieces here, but I believe that because of the fluff and the structure of the sentences that what applied to the character was too confusing to actually get to or understand. I really liked the clues like the one with the curved to a fine edge, but the other references, to me, were too mired.