The tension builds when Kylie, 18, leaves the track within minutes of arriving.
"I actually can't believe that Kylie's leaving right now, just because we never get to spend time with each other," Kendall says in a solo interview. "I travel a ton for work, and even when I'm home in L.A. I feel like I don't even really get to see Kylie as often as I'd like to."
"To have a moment to spend time with your dad and your sister, I would take it," Kendall adds.
As an Escalade carrying Kylie and one of her pals drives off, Caitlyn appears on screen, asking Kendall what the "deal" is with Kylie.
"She probably saw the opportunity that you were occupied and she could go home and do whatever she wants to do," Kendall explains. "But seriously, if I'm being honest, she was here for you, and then saw that I was here and felt it was her opportunity to leave, and go back to being with her friends."
When Caitlyn tells Kendall she tried to get her to go to dinner the night before, Kendall chimes in, saying, "She doesn't have her priorities straight."
The Kendall and Kylie drama doesn't stop there, however. In another teaser clip from the episode, Kendall is fed up when Kylie's 26-year-old rapper boyfriend, Tyga, shows up during their family's trip to St. Barts in August.
"You could have taken this time to be with your family," Kendall says, clearly irritated. "I was really looking forward to this trip to hang out with you," she later adds.
This trip marked one of Kylie and Tyga's first major outings as a couple, following their PDA-filled trip to Mexico for Kylie's 18th birthday.
Earlier this week, Kylie followed in Kendall's footsteps as she made her Vogue magazine debut, appearing in a photo shoot for the fashion mag's January 2016 issue alongside Bella Hadid and Lottie Moss. Back in September, Kendall made headlines when she announced her appearance on two separate international Vogue covers in 24 hours -- Vogue Japan and Vogue Paris.
As we patiently wait for the next episode of Keeping Up With the Kardashians that airs Sunday at 9 p.m. ET/PT on E!, watch the video below to see more from Kylie's gorgeous shoot.