I basically agree with GEL and SD that a neutral response is probably best to avoid giving her a toehold for additional remarks.
I think you were extremely wise not to respond physically, because it probably would have led to her saying something very predictable like, "Why do you always have to yaddayaddayadda..."
But it also occurs to me that a response to what she said about not feeling loved might be something like (looking her dead in the eye): "Let's get one thing perfectly clear. I do not doubt that you love me. My knowledge that you do love me is the ONLY reason I am still working on this R. I don't expect you to 'make me feel loved.' I expect you to treat me with respect." Then if she tries to get into a convo about that, say, "I spoke clearly. You heard me." And refuse to debate or get into it with her.
