Once I resurrect Hirge with the scroll of restoration in the inventory screen, I go to Hirge's icon, and use the scroll of restoration again. It does not heal Hirge but it heals me. (ie, Hirge only heals once from my use while I am healed twice from her use and mine). If I exit the inventory screen after resurrecting Hirge and go back into it to have Hirge use the scroll, it works as intended.