She’s living her best life. Kai Trump has released a video of her shopping at luxury grocery store Erewhon in Los Angeles — and she was staggered by the prices. The president’s granddaughter shared footage from her trip to the city’s ultra-luxe eatery and showed off some of the items she snagged. The 18-year-old revealed to her 1.45 million followers she bagged the viral Hailey Bieber smoothie for $21 and a $10 lemonade. She says in the clip: “If you guys don’t know Erewhon is the most