Maycee is descended from an aristocratic family that dominates the United Worlds in Science, exploration, and politics. They also carry a genetic fault. Without her dependence on the addictive mutagenic, Flutter, Maycee will experience gradual brain damage ending in collapse and catatonia. Flutter also causes systemic mutation--which accounts for her scales.
She's always fragile. Anything could upset the mental balance controlled by Flutter and drop her into catatonia.