Rather than continuing to just tell people she's not in pain, why not tell them she can't even perceive pain physically anymore (and suggest it might be a side-effect of her illness, etc) if she really wanted them to stop. It does kinda seem like she wants the sympathy points, and really does want them to keep asking.
But... that's not what living with anything chronic is. I don't have a chronic pain, I hope I never do, but I have other similarly chronic concerns (ADHD, depression, and a few others). Some people don't realise, or don't
want to realise, that being treated normally, being taken seriously when someone says they're okay, is what one might want, so I think her reaction there was correct. I shouldn't need to explain all the ways in which my daily life is broken or at least abnormal, all the ways in which I'm managing my own conditions because no one else can do it for me, to finally get across that I am okay, and that I will ask for help when I want/need it.