Hm, hard to say, but I imagine Rachel has to know enough about Cas' shenanigans to want to kill him. That's a pretty drastic move, though angels aren't exactly half-measure type of folks. So maybe not necessarily the Crowley part, but at least Cas has eyes on Purgatory souls, which is probably considered a no-no by Heaven standards.

I do find it interesting that Eve doesn't know, and considering the infodump she gave, haha, I don't think she would've hesitated to drop that fact if she knew.

Word on wanting to know what's gonna happen! Now I kinda wanna go back and rewatch some eps to gauge Cas' behaviour.