Meghan Markle has been advised to tread carefully with the rollout of her glossy new lifestyle brand, American Riviera Orchard, amid Kate, Princess of Wales’ cancer diagnosis. “As Meghan is no longer part of the monarchy, she is free to launch her brand whenever she likes,” PR expert Lynn Carratt dished. “However, given Kate’s ongoing cancer treatments, it would be wise for Meghan to be sensitive to the timing of her brand launch, considering the public support for Kate worldwide.” The analyst advised the Duchess of Sussex to “work quietly” on the brand “behind the scenes,” and to wait until t…