I don't think you are being a Grinch. There is nothing more frustrating than knowing somebody doesn't understand you and there is no way you can make them understand you. As you have pointed out, it is good that your boss is taking the time to think about you and to encourage you to get better, but personally, since I don't think there is any way of pointing out how you feel to her without insulting her, I think you should just try to accept her attempts to help you.