What happen when someone started a gambling round, and you turn into a tree?
I would presume Erin still need to gamble?
It depends who's turn it is when she becomes Tree. If it's Erin's turn, the rules cover this explicitly:
If Erin turns into a tree during her own turn, her turn ends immediately. This means several things:
- If a Gambling Round is underway, the anted Gold goes to the Inn.
If it is another player's turn, then Erin participates in the Round of Gambling as normal, but if she plays any cards (e.g. to avoid paying gold or to take control of the Round of Gambling) then she immediately becomes an Elf again.
TL;DR: If it's Erin's turn, the money goes to the inn. If it's another player's turn, then you have a tree gambling as though it were normal.