Ursula Le Guin's 1986 essay, "Prospects for Women in Writing", opens with the sentence,
It's only been about two hundred years since women gained access to literacy and began to empower themselves with that great power, the written word. And they have written. The works of women acknowledged as "great" -- Austen, the Brontës, Dickinson, Eliot, Woolf -- make a high road for other women writers to follow, so wide and clear that... [etc.]
If this 'claim' is true then I think it may be relevant to topics such as https://skeptics.stackexchange.com/questions/17000/are-men-more-creative-than-women
So, to what extent is it true? If this topic needs to be narrower, perhaps restrict it to "English-speaking women" (Le Guin is American).
To provide context, the essay ends with,
... Wolf knew that and said it in the 1930. Most of us forgot it and had to rediscover it all over again in the sixties. But for a whole generation now, women have been writing, publishing, and reading one another, in artistic and scholarly and feminist fellowship. I we go on doing that, by the year 2000 we will -- for the first time ever -- have kept the perception, ideas, and judgments of women alive in consciousness as an active, creative force in society for more than one generation. And our daughters and granddaughters won't have to start from zero the way we did. To keep women's words, women's works, alive and power -- that's what I see our job as writers and readers for the next fifteen years, and the next fifty.
The context of the question makes it clear that "women gaining access to literacy" means women being able to write/publish works which will be read by other women -- so, please ignore examples of women who can read when all the authors are men, and/or women who can write when all the readers are men.
A now-deleted answer said that the answerer didn't know what was especially significant about the "200 year" number. I note that most the authors in the quote (i.e. Austen, the Brontës, Dickinson, and Eliot) all worked approximately 200 years ago: and so I guess that the existence of those authors was the reason for LeGuin's saying "200 years". The author of the same deleted answer then said something to the effect that that the existence of those specific authors was remarkable or unprecedented in some way: but I don't know in what way, or why it was such authors came to be, then and not before.
My guess is that the cause was two-fold: women being educated less than men were; and a social bias which kept women (especially aristocratic women) from any 'commercial' activity including publishing.