I'd be ready to seat a healing light ( candle ) and pray for the person , though as others noted I'd need some link, name and birthdate perhaps. You can mail them to people , and they can help You better so.
You can also set a healing light Yourself, it's fairily simple :
Get a blue offertory candle and dress it with some Healing or Blessing oil, If You don't have them at hand place You'll place some Altahea roots around the base of candle. Prepare a name paper witj written name of the person, surrounded by the word healing , written in continuation forming a closed circle around the persons name . Fold it thrice and place under small coffe saucer . On the Saucer burn blue candle, dressed with Healing oil from top down, and say words of power You preffer ( for example Psalm 6th 3rd verse , or Psalm 170th20th verse etc ) If as I meantioned You lack oil, place some Althaea roots around the candle. It would be great If You would be able to send them a gris gris bag with Peony Root, Angelica, Althaea root, Lemon Balm , and Sampson Snake root inside, perhaps an amulet of Dr Gregorio Hernandez Or Mamzelle Leveaux, she is known to help heavily sick.
Also pray to Archangel Raphael for her.