Her first priority was finding Madam Pomfrey. It was relatively easy, but convincing her to go and help Snape, or at least find someone willing to bring him to the infirmary, was difficult. It took a lot of persuasion and eventually outright begging along with a fumbled recount of Snape supplying her with potions and saving her life. But eventually, Madam Pomfrey listened. Although Harry’s support helped.