Then we are getting into schroeder's cat territory if we are looking at it that way.^ How do you know that Sela didn't exist all along? Just because we never saw her before "The Mind's Eye" doesn't mean she wasn't around.
What we know about Predestination paradox based on TV, it's one timeline, nothing changed and events always played out that way.
'Yesterday's Enerprise' is not that because it introduces an element from an alternate timeline (alternate Tasha) who no longer exists in the original timeline.
Not exactly. In 'Yesterday's Enterprise' it was implied that the Enterprise C was/would be destroyed with all onboard while in Redemption there was a mention of survivors.There is absolutely no proof that the timeline at the end of YE wasn't exactly the same one as existed at the beginning. The timeline was only changed once; at the end, everything was reset to the way it was before.
She has intimate details of her mother, probably she can DNA test if requested. It's a very strange play by the Romulans to make up such a story that a dead crew member was still alive in another timeline and went back into the past of their timeline to give birth to Sela. Guinan confirms who Sela is too doesn't she?And again, we seem to be taking it on faith that Sela is who she says she is. I'm not sure we should be doing that. Assuming she is indeed Romulan...why should we believe a word she says?