Oh a rare case of a Memento created at the death's doorstep. I like the idea but I think you should do some changes to her current personality, or it would be to hard to add her into the plot, trough for now since your CS is the first one (not counting mine) which is not just a skeleton, there is next to not ideas which possible plot I should take the future IC in.

Well the main issues are:
Lessen her negativity towards Activators if not humans at large so she can be brought into the probable future group(s) which will consist of our characters.
Through the near-death experience plus the creation of such a odd Memento would probably change her personality her self would stabilize itself in up to a weeks time. Any new personality born from such way would still be build on the basis of the old one so you need to take this in account.