What should I do, as I have hurt a friend with words, apologized to her, but she has not forgiven me?

Satan strives to sow discord among believers, and it is incumbent upon Muslims to seek reconciliation. If you apologized to your friend and she did not accept, then you have fulfilled your duty, and the better of the two is the one who initiates the greeting of peace. We advise your friend to accept the apology, and we advise you to continue your efforts for reconciliation without tiring.