Looking at the "Sharon wasn't supposed to be there" meme

A number of people have been quoted over the years saying "Sharon wasn't supposed to be there" (at Cielo the night of the murders) or words to that effect.

The Family, by Ed Sanders (2002 edition) pg512
She(Doris Tate) believed that the Manson group had advance word that Sharon Tate was not going to be at the house that night. ... we learned Sharon had intended to spend the night with a friend.
Manson associate Vern Plumlee had told us that he'd heard the Family thought she wouldn't be there. My recollection was that on one point during the trial, Krenwinkle had hinted to one of the attorneys that Sharon wasn't supposed to be there.

Susan Atkins' lawyer has also spoken words to the effect that Sharon wasn't supposed to be there; presumably Susan told her this.  Also Sandy:

From PaulcastVanIsle:

"The other thing is there are major faults in Statman's book like her saying that Sandra went over to Patricia Tate during the intermission Of the Beatrice Barry show And said Sharon shouldn't have been there that night.  And that she was stoned on Coke Those are two separate things and Sandra said the part about Sharon shouldn't have been in Hollywood during the show. She also never spoke to Tate during any breaks or after the show."

waxidermy.com/dr-jaques-hondorus-within-a-cosmic-odyssey/
comments: Bently Merrick  November 10, 2013
In the 1973 documentary titled “Manson,” Jaques Hondorus was mentioned as someone who had warned one of his ‘students’ Sharon Tate to leave her home and not to return. Hondorus was also a mentor to the director of that documentary, Robert Hendrickson.
This mirrored what a man named Vern Plumlee (a confidant of Charles Manson) had stated, as well as the lone survivor of the murders (who was living in the guest house) William Garretson. Vern said that he was told that Sharon was asked to leave and Garretson said that a man in a car told him to leave, and to make sure everyone is gone from the home.

These are puzzling statements, as they imply that the Mansonoids had advance intelligence on who would be up at Cielo, even before the murders occurred. And this further implies that the victims were deliberately targeted, as Krenny once claimed.

Krenwinkel January 20, 2011 Parole Hearing Transcript  pg46
INMATE KRENWINKEL:  I did know that that was, the plan was to murder two women inside the house.  That was given, was a given.

 

Or another interpretation might be that this was an attempt at victim-blaming.  Mansonoid:  "Well it wasn't our fault that Sharon decided to break her date with Sheila Wells to spend the night at her house, so you can't blame us for her death."

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And that's about all I have on this topic.  If you have any citations to add, please do so.