"She didn't see any competition from, in her words, Horsey, Fatty and the Kid," a show insider told Us Weekly in a cover story published in the magazine's March 5 issue, referencing Robertson's alleged respective nicknames for Cox, Sterling and Boguskie.
"Courtney told her family she had it all wrapped up," the insider told Us.
"Courtney looked at The Bachelor as a game," an additional set source added. "Ben was the prize, and she was going to win."
The new Us cover story also reiterated the magazine's prior report that Robertson fooled The Bachelor producers during the show's casting process.
"She came in and seemed very vulnerable," the insider told Us, which reported Robertson presented a "carefully concocted image" of a "lonely model."
"She talked about not getting asked out a lot."
Robertson's limited interaction with her fellow bachelorettes was also premeditated, according to Us sources.
"Courtney said her agent prepared her well and told her not to share any personal information with the girls," the set source said.
"She kept in her own corner the whole time. She never made conversation with the girls and was very standoffish," the insider added.
According to Us, The Bachelor also isn't the first time Robertson has appeared on a reality show. In 2006, she competed -- as "Courtney Robinson" -- with Mark Hewlett, her boyfriend at the time, on Treasure Island: Couples at War, a Survivor-like reality competition which aired on New Zealand television.
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"I guess she had a desire to be famous," fellow Treasure Island contestant Jaime Claxton told Us. "Why else do a reality show?"