I'm not okay too. But don't worry, she comes back in season 2... and I want she became the adoptive daughter of Scrooge.

Scrooge: As I promised you, you are now a member of this family.

Lena: Thanks you Mr. McDuck. (give a hug)

Scrooge: Please, call me Uncl…

Lena: Dad!

Scrooge: But I… With pleasure!