Are items shared when hiding alone?
No. When hiding, you are not allowed to vote. Since there are no votes, the outcome is considered a tie, and in the case of a tie, no one gets anything. The items remain on the location.

In the FAQ (PDF):


  Q: Can a hidden character (Little Girl or Little Boy’s power, or Hiding action card) take part in sharing anything?
  A: The character can’t vote, but can receive an item.


And on page 6 of the Rules (PDF):


  Be careful: in case of a tie in the sharing vote, no players get anything. They remain on the location.