Definately a little nute burn going on. I'm not certain that's your only problem, though. She needs to be transplanted out of the cup into a bigger container. Start with a transplant and give her some pure water for the transplant watering and the next watering.
Transplanting can cause problems when attempted during flowering. Plants should already be in a pot big enough to finish flowering in before flowering begins. When you move her, be very gentle.