I would just stick with one food until she starts eating it. I had the same issue with Lion.. He would barely pick at his food(ZiwiPeak) for a few weeks, and would only eat a full meal when he was starving. I followed everyone's advice and didn't bribe him with anything else... Now he ALWAYS eats everything I give him!
Now that he is eating well, I switch between two different types of food every day(ZiwiPeak and S&C) for variety, but he never skips a meal anymore. Just be consistent until she starts eating regularly, and then you can add in some variety if you want.
That said, if you think she isn't eating because she is sick, I would take her to the vet. Most likely though, she is just being picky