...it's a possibility that when you say MK ultra, it means something quite different to me than to you. Please link me to what she said.
I don't know the exact interview right now but I remember her doing interviews where she talked about the fact that a lot of Hollywood people are involved in or subjected to trauma based mind control which involve things like deliberately creating multiples. I think Roseanne says she has DID herself.
When people who are victims of trauma based mind control have been interviewed they say this really started in earnest after WW2 and during the Cold War era where nazis who came to the US during Operation Paperclip were used to continue their evil mind control experiments because the US government wanted this technology for their own benefit. This included things like Project Monarch which many people have testified about and which involved splitting people into different personalities when they were very young and then programming those split personalities to do various tasks.
For example it's often alleged that in Hollywood the rich pedophiles have children split through trauma based mind control into a sexually receptive personality (often called a sex kitten personality or beta programming) and a normal personality that isn't aware of the memories the other part of their mind has locked off. So the daytime personality can go to school, look happy with their abusers, etc. and evade suspicion and then when the pedophiles want to abuse them they wake up the hidden personality. Common "Triggers" for calling forth the desired personality could be disney characters, alice in wonderland or wizard of oz imagery, willy wonka, or Labyrinth imagery.
Supposedly after a certain age a lot of this programming often begins to break down and the memories start to leak through and come back (the process isn't perfect to begin with). So that's why a lot of people who weren't killed or otherwise disappeared grew up to eventually be able to talk about what happened to them because they would start to remember things. Other people grow up and realize that they really don't remember large chunks of their own childhoods and don't necessarily know this isn't normal.