TPTB keeps talking about Rachel having her Breaking Bad moment when everything came tumbling down so I think that whatever revenge plans she has about Quinn and her part in the Adam saga would be more precisely planned out. I'm scared
but also intrigued at the same time as to how it'll all go down. I don't think she will kill her though and neither do I want her to. No matter how screwed up it is, I agree so much that it's the most genuine relationship Rachel has in her life. Quinn's like her pseudo mother figure in some ways.