Natalie Harp was seen boarding Marine One on Friday to travel with President Trump, seemingly unfazed by recent allegations of an unhealthy obsession.
She wore a blue and white ankle-length gown with nude heels as she climbed aboard the aircraft.
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The trip took her to Myrtle Beach, South Carolina, for a campaign rally supporting Senator Darline Graham ahead of Tuesday's Senate runoff.
During the rally, Trump encouraged voters to pretend his name was on the ballot "one more time."
Harp has been in the spotlight all week after her brother, Preston, publicly criticized her for having an "unhealthy obsession" with the president.
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He also suggested she isn't physically attracted to Trump.
Additionally, intimate letters Harp wrote to Trump in 2023 were revealed, including one where she apologized for contacting him instead of the Secret Service when stranded at an airport.
She also expressed regret for stepping on a golf course while he was playing.
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In another letter, she wrote she wants "things to always be right between" them.
A second letter showed her concern that Trump might have an unfavorable view of her, adding he has the "absolute right to cuss me out, if need be, when I deserve it."
Trump has not publicly commented on the relationship chatter and continues to keep Harp by his side.
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Senator Jon Ossoff also mentioned Harp during a speech, claiming Trump would rather travel with her than do his job.