sherw00d
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The wheel only lists heroes from the multiplayer mode.
Isabelle develops in the same way as any other hero from Haven; use the general template for them, and you'll be fine.
Pay attention to the game version. The wheel should match the version! Usually, you can find a wheel for version 3.0 online, but you probably have version 1.5 or even 1.0. Check it. This number is displayed in the main menu of the game.