There wasn't quite... all that much for her at the End of the World Party. Besides the communion wine, Vesper didn't drink all that much and she was absolutely aware what goes on parties like that. She would have stood out like a sore thumb. And perhaps she would have run into someone and she would have turned all of 12 years old compared to the more worldly women at the party.
Vesper squeaked at the hug but managed to return it with one arm. She had been too eager to give a hug to put hers down, but it didn't matter. No harm done. "Oh, I would have rounded your way with bells on my ankles, regardless! Still, it's been longer than it should have so I won't complain."