Can't get Cassia into hideout, just states that I need to complete her Act 1 quest.

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Menemnon wrote:

For all my characters where Cassia was missing and I needed to do the "Strange Growths" mission to unlock her, I went to a lvl.1 Wharf map.

She is always there when I need that quest for a character and always the same location, quite close to the start.

Hope this helps!

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ixtli wrote:

Note: if you are mapping using a constant supply of other masters' missions, you're effectively blocking her from appearing. You can't have two hideout masters concurrently running missions on a map.

Run maps without existing masters until you see her on each character.