Out of the corner of her eye, Helga saw some movement and turned to look. Seeing the young lady present, she beamed, "You must be Arianna!"
She walked right up to her and with both arms extended, took both of Arianna's hands in a gesture that was welcoming and inclusive. Helga only stopped short of giving her a hug, since she didn't know how Arianna would react.
When Albus rose and scattered his books and papers, Helga giggled, then asked Arianna, "Is he always this way?" There was a cheerful glint in her eye before she turned again to Albus. "Let's help you," she said, specifically including Arianna. "What are you studying?"