So sorry to hear that your friend is in pain, @vanessa13. You have a warm heart to try to find help for her! 
Adding to Francisco’s wonderful spellwork above, I also recommend:
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Silverbear’s lovely Healing Spell and Prayer
Rest assured that you can always adapt chants and prayers to suit the situation (adding your friend’s name or direct references that are meaningful to you).
Wishing your friend a speedy post-surgery recovery! 
