I think 2 is the lie, as her first language is Russian, and she is shown in her gallery in a Christmas-themed outfit!!
1. Despite working at a carnival, she has never eaten cotton candy, as she's not supposed to snack on the job.
2. She only worked at her job seasonally, however, this season was the wintertime.
3. Her necklace is her most prized possession, but she is still willing to let others hold onto it for a while.
YOOO YOURE SO CLOSE!! 1 is the lie!! She ate cotton candy once when spending time with Miss Flame before the theatre tent's show started, and Mr. Henrie is far too chill of a boss to enforce any rules dfghjfghjk!! 2 is a truth, she did seasonal work during the winter, although the fair itself ran for the whole year!! Thank you so, so much for guessing, and your reasonings are really good!!