Margaret Atwood has written much more than those two books - she is a prolific author. According to Wikipedia she's she has published 17 books of poetry, 16 novels, 10 books of non-fiction, eight collections of short fiction, eight children's books, and one graphic novel, as well as a number of small press editions in poetry and fiction. Her works are popular, both with the general public and with critics.
That reads to me like a post-facto characterization based on perspective rooted in today's political climate. Personally, I find her books to be somewhat overrated compared to other works of "genre fiction", but having read some of her books, the "feminist" characterization as you are presenting is misleading.
https://www.google.com/search?q=margaret+atwood+-feminism&rl...