House of Roots and Ruin by Erin A. Craig

When Verity receives word that the Duchess of Bloem - wife of a celebrated botanist - is interested in having Vertity paint a portrait of her son, Alexander, Verity jumps at the chance, but Camille won’t allow it. Forced to reveal ithe secret she’s kept for years, Camille tells Verity the truth one day: haunted by tragic childhood events, Verity is still seeing ghosts, she just doesn’t know it.