I suppose thats her "torment". She's lost wandering the dark realm.
Sora and Riku didn't meet her simply because they didn't, they didn't meet every single heartless in the dark realm, they don't have to meet EVERYONE, they simply didn't bump into her. They were there for a very short time anyway, like 3-5 minutes.
Then Ven has an incomplete heart, and has to stay in sora to survive. His body is lifeless in the room of awakening.
Terra's existence is split between a lingering sentiment and Xehanort.
That convo between MX and Terra in the secret ending suggests that Terra's heart is actually in Xehanort and is slowly being absorbed into Xehanorts heart.
LOL.
Did you even pay attention?
That scene has to be after BBS why?
She thinks Terra and Ven are still alive.
She thinks one of them has the keyblade.
She assumes that Ansem has all the answers.
Shes the same as in BBS.
We can assume either time has not changed or time has stopped for her.
Ansem mentioned hed been there several times.
The tagline efore the scene says
"Two that should not have met"
Implying something went wrong (ansem) and there destinies crossed when they werent suppose to.
Also the fact Ansem talks about the ORG.
And Aqua is still stuck on Terra and Ven.
Hes talking of the future she talks of the past.
Eh, she could be "frozen in time" but time travel...
You have this whole "his heart is in him, his heart is there" "realm of darkness, realm of light, realm of nothingness, realm of in-between".
Adding time travel is just..egh, lets let time travel stay @ timeless river.