You literally transmute matter at will, you do not need to fight Killcannon just turn his robot arm into cheese or something. Your nemesis is a villain that you do not need to consider the whole cannot effect living tissue thing for even a second. That is all.
Eve can’t manipulate living things due to a mental block, I don’t think she is restricted from creating/rearranging organic matter.* Don’t we see her alter/create plant matter?
One weakness you missed, the toxin from that one flower, is just a chemical compound which is her whole thing. As someone with an innate understanding of chemistry, I don’t think her mental block would prevent her from creating matter as sharp as a Ragnar’s claws or as tough as their hide. I don’t see why she couldn’t create a synthetic form of the scourge virus (though I doubt she would ever do that one) or the flower toxin.
EDIT: *By which I mean, organic matter that isn’t currently living.