I think it’s totally fine. We know someone admitted last year that wrote a hilarious essay about a minor mishap. It was totally quirky and crazy. He however did not get admitted to a number of lesser schools that did not “get” him. Especially if her CA essay is more traditional I think going for her true personality is encouraged. When my son told me his topic of choice I had that internal parental angst that it was too silly and silly for silly’s sake but once I read the actual essay I could see his sense of humor and intellect. It would still not be my choice but I don;t think it will hurt his chances and meshes well with his serious CA essay and fairly personal LORs.