I think you should go with the redemption angle. If this was cannon Taylor I would deem it not such a good idea, but this Taylor has bits and bobs of Jean's personality floating around, and Jean is a good person last I checked. It could be a small plot that happens in the back ground where they slowly rebuild their friendship while the main plot is happening and come to head whenever you choose.
Either way, this seems a bit too open ended to be a place to end it. It's too emotional and leaves Taylor with too many questions on her mind. That, and if Emma really did do some soul searching and is finally seeing sense again I can't see her not trying to at least talk to Taylor one more time.
Point being, that putting a redemption angle in for Emma can only, in my opinion, make the story much better then it already is. As is, the story already has an optimistic feel to it and while that probably won't last it would be a shame for it to go away completely.
One could argue that just how strong Emma's hate for Taylor was in Worm shows how much she actually loves Taylor. Worm has a big theme of self deception, and Emma's whole thing is that she uses her hatred of her past to cope with the present. Present Emma fools herself into thinking she's stronger then she was in the past because if she is then she won't be mugged and almost raped again. It's why she hates Taylor, cause Taylor is a walking memory of past Emma, who was weak and couldn't save herself.
It's just sad and pathetic, and why I have a soft spot for stories where Emma actually gets the help she needs and patches things up with Taylor. Also why I never feel sorry for Shadow Stalker ever, because dat bitch is stupid crazy.