just an idea its not official tho
and there was a question there thats been left Unawnsered so
I mean that could be why she didnt back at that point
seriously Harada says she's missing not dead
so over the years
Jin defeated Ogre
Turned into Devil Jin for the first time
been captured by Heihachi in Hon-Maru
Escaped while Heihachi and Kazuya dealt with Jack-4s
which eventually Kazuya escaped and Honmaru exploding Resurrecting Jinpachi
which Jin also defeated
became MZ Leader
And caused Chaos all over the world
which Freed Azazel
Jin Sacrificed himself to defeat Azazel
Where was Jun through all that?
Why didnt she come back between those points?
There's got to be a reason why she didnt appear
If she isnt dead then she wouldve appeared within those points?