Which line from the excerpt provides an implied detail about the restrictions women faced during Elizabeth’s time?

“Well, that is a brilliant idea, Miss Blackwell, but clearly it is an impossible one.”
“. . . you may borrow from my library if you wish.”
. . . Elizabeth visited an old family friend who had been practicing medicine . . .
When she told him of her intentions, Dr. Melton’s eyebrows nearly took leave of his head . . .