She said she was in a giant dark space with reflective floor and a top lighting - like on a giant stage.

She had two handfuls of  marbles that fell off her hands. The transparent glass was hard to find in the hard light, and she had to pick them up to not trip on them, but you could just barely see the shadows. The more marbles she picked, they multiplied. And it started giving her anxiety to not have a place to put them and that she would never finish picking them up.