As long as you keep her alive and she doesn't get too wet, she will probably not mildew and die. It is easier to clone a veg plant than a flowering plant. It takes less time to clone a veg, that way there is less risk of mildew. Your clone of a plant in flower will need to go into veg before it sprouts roots. I would give her at least two more weeks than a clone taken from a veg plant.