Yeah, I completely forgot that at the beginning, they even said she has PTSD and has no memories of what happened.
Been reading up on the missed details and Easter eggs in the movie and found the following interesting:
Apparently the red outfit and one glove they all wore was a reference to "Thriller", which is the last good moment of Red's life before the switch.
The reason she speaks hoarsly is due to Adelaide choking her out when she did the switch.
When she tells her husband about encountering her other self, the flashback shows the opening scene inverted, showing it from the Tethered's perspective.
She was 15 steps ahead of them, she arranged for Jason to play with his Tethered so he would learn about the mimicry and set it up so she could snatch him when he used it to kill his tether (Red already stated earlier she viewed her children as abominations).
She allowed herself to die in front of Jason, so he could know the truth about his mom, so presumably she told him about the switch long ago.
The handcuffs she used on Adelaide in the house are the same ones she used on Red when they switched places.
The Bible reference in essence states that evil will come to those of their making, so it references and foreshadows that this uprising only happened because of what Adelaide did with the switch.