DM and I had what I would consider a very minor disagreement a couple of weeks ago (back story here but if you don't want to read it, basically we didn't manage to meet up as she texted DH to change the meeting location 10 minutes before the meeting time. She has a lot of social anxiety and while I understood she uses texts because she hates talking on the phone, I decided after a day that I had to let her know that texting with 10 minutes' notice isn't adequate - you have to phone - in case we were in a similar situation again.)
She's been disputing this, by text, I have been (I feel) utterly polite and reasonable throughout, but her last text to me yesterday sad "You should be ashamed of your cruelty. And stupidity too, misinterpreting what happened ... I will never recover from your repeated attacks." I haven't been attacking, or "going on" at her at all, and my texts have been really ,really mild, but she's obviously taken things totally the wrong way.
I'm really pretty devastated by this - her calling me cruel and stupid when I would never dream to be towards her. Nothing like this has ever happened between my mother and me in 40 years and I'm really starting to worry that she's having some kind of breakdown because her reaction is so out of proportion to the issue. It's totally out of character too - normally she is reasonable to the end, always willing to give people the benefit of the doubt and see things from their POVetc ...
Because she won't talk to me, the only thing I can do is write, to try and put my side across. I'm worried that every new thing I say will inflame her even more, but I can't leave this having her thinking I'm cruel! Does anyone have any suggestions, please?