Dragon age 2: how to get isabela back in act 3?

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I'm ultimately trying to do the quest No Rest for the Wicked to get Ambrosia for the Supplier achievement. This is my second playthrough so spoilers are fine. I told Isabela in act 2 that she could keep the artifact, but since she wasnt max friend-ed or romanced, she split and didn't come back. However, she didn't dissappear, she's just grayed out. I dueled and killed the Arishok at the end of act 2 and I read on DA2 wiki that she should be in the Hanged Man, but I don't see her in here|||If she doesn't return just before you fight the Arishok, she doesn't appear in the game again. You have to have high friendship or rivalry with her (above 50%) and talk to her multiple times throughout Act 1 and 2. She will still take the book with her once you find it, but she will return to you before the fight, and then remain around through Act 3.