how did Erik Vanderbergs widow respond when Hans Hubermann came knocking at her door?

She is still distraught at her husband's death but Hans is able to bring the spirit of her husband back for a few moments,

He taught me to play,” Hans informed her, as though it might help.

Perhaps it did, for the devastated woman asked if he could play it for her, and she silently wept as he pressed the buttons and keys of a clumsy “Blue Danube Waltz.” It was her husband’s favorite.