St Mungo’s is where she crossed paths with Hermione. They were paired up on the emergency ward during the first week, it wasn’t great. It continued horribly, for a few more weeks until one evening they both walked out of a patient's room, took one look at each other and just collapsed on the floor in a heap of giggles. Thank goodness the halls are silenced to prevent hallway noise disturbing the patients. When the giggles subsided, she suggested they get a drink to recover and, to her surprise, Hermione agreed.