I don't want to confirm or deny anything specific but I will say that Kaz in particular put a lot of effort into constructing some Changeling lore for their relevance to the story, and the incompatibility with any of that is why we officially drew the line in keeping up with canon at Thorax. That boy literally screws us over as early as page 1, so him and most of the expanded Changeling lore that came with him are pretty much ignored entirely for our purposes. (Also, we both think the reformed Changelings are sort of uggo anyway. >_>; )
We've very much got our own thing going on, and we hope y'all enjoy it!
I am unaware of any canon family issues with my gal Chrysalis, though also I never watched the last couple seasons. Now I am intrigued...
That flinch is her last moment to decide if she's going to commit to what she's getting into or not, one final fleeting remnant of the doubt and hesitation she's been grappling with throughout the chapter. When she places her hoof on Ed's, she is making that decision.