While barren, she gave her Egyptian maid Hagar to Abraham to bear his children
She had an Egyptian slave-girl 
whose ... 4 He went in to Hagar, and she conceived; and when she ... shall bear a 
son; you shall call him Ishmael, for the Lord has given heed to ... Sarah first 
shows up back in Genesis 11where her one claim to fame is that she was barren
.