Do I actually think Imogen is going to turn on the party? No. I don't think it’s any more likely to happen than I did Fjord releasing Uk’otoa, or Caleb returning to Trent and the Vollstruckers.

Given the nature of the game, any character turning fully dark is unlikely, seeing as it would take them away from the party for a time or potentially even turn them into an npc, replaced by a new pc. So far the only time we've gotten close to seeing something like it happen was Yasha siding with Obann, which could only happen specifically because Ashley was gone from the table for a long time (it was also the product of mind control, not an active choice to turn dark, and as such still doesn’t really count as a pc turning on the party in my eyes).

But the possibility is there. The seeds planted. Travis has talked about how, after he threw the falchion away, he briefly considered having Fjord leave the party and retun to the coast and Uk’otoa. Liam has mentioned that, early on, Caleb returning to work for Trent was a very real possibilty. It can happen, if the players and narrative are open to it.

And now, canonically, Imogen is desperately and understandably searching for a reason not to have to fight her own mother. She is, however briefly, questioning whether the Ruby Vanguard might have a just cause. Much as she hates it, she also feels the allure of the power Ruidus gives her. Her closest ally is someone who has repeatedly assured she will stand by her no matter what she chooses, even after she voiced the possibility of letting Predathos get out. None of these parts of Imogen are evil, and all of them are understandable and deeply rooted in pain and ostracization, but they could very easily be turned into justification, were she pushed enough.

The seeds are planted. Again, I don’t think it will happen (she seems firmly against the evil plan when reminded of how evil it is), but there’s certainly nothing strange or hateful about engaging with and being interested in the darker possibilities as presented in canon. It isn't character hate to acknowledge that Imogen has the potential to go dark, much as Fjord and Caleb and Yasha. To me, it’s what makes her character interesting. I want to see her clash with the party, whether because she’s desperate to save her own mother or because she’s high off the power of Ruidus and lured in. I want to see Laudna have to choose between the world and her promise to stand by Imogen no matter what. I want to see the fallout, the slow healing and redemption and coming to terms with bad choices. I eat that shit up, and if it doesn’t happen in canon I'll probably go read some fic about it to get my fix.