Sounds like she has a bad attitude about your condition and may not understand it well enough. As long as you know you are doing well then it shouldn't really matter what their negative opinions are.

I've had people been negative to me numerous of times and it sucks a lot. Their negativity can bring you down to a whole other level so I try to brush them off and carry on. I've lost several friends in the process, but I don't need anyone in my life that considers me a hopeless mess. People can be so cruel to others that they just don't understand with bias assumptions.