I just had a quick look at what I started here! I haven't read all the comments yet, and will post a longer comment after I do, probably during the weekend. But I'd like to thank everyone who has commented here, and I'm very heartened to see so many people are interested in this issue.

I've come across a few things here I hadn't thought of at all, such as the possibility that this woman has dyslexia or another similar reason for having difficulty with her writing.

I've also been musing about this more myself. I think two things in particular have helped with writing. (Besides having good teachers and instruction.) I've always loved to read, and just as with music, probably picked up a lot via the Osmosis Method. I also think that studying other languages has made me more aware of vocabulary, syntax, etc. in English.

Anyway, I'll say a bit more after I've had time to read everyone's comments.