If she “noticed” afterwards... could be a stray cigarette flick, too.
Exactly. Does “noticed her sleeve was charred” = “set on fire”???
Seems like a little editorializing there.
Years ago (before no smoking in public places) I was standing in line in an airport and a man nearby dropped flaming cigarette ashes on my suit lapel, burning several small holes in it. When confronted with that he merely shrugged and said "Sorry."