If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
I'd never heard of her until I read her obituaty yesterday, which is a shame but not unsurprising. Given the scarcity of women who win Nobel prizes especially in the sciences, I thought it was worth a flag up and thought people might be interested. She certainly seemed to have led an interesting and eventful life.