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Tear Jerker: The Finder
Willa tearfully confessing to Isabel about Timo's arranged marriage.
The heartbroken look on Willa's face when her uncle Shad mentions that after her probation ends she'll have to leave the Ends Of The Earth and rejoin the family, meaning she'll never see Walter or Leo again. She's subtle about it, but you can tell the thought of that bothers her.
The looks on Willa's face throughout her last scene at "The Ends of the Earth" since she's already decided what she's doing, but can't tell them she's doing it.
Her hugging Leo right before she walks out the door.