Which line in this excerpt from "the lady of shalott", by alfred, lord tennyson describe actions taken by the lady of shallot to defy the curse?

“With a steady stony glance—
Like some bold seer in a trance,
Beholding all his own mischance,
Mute, with a glassy countenance—
She look'd down to Camelot.”

These are the lines that depicts the Lady of Shallot defying the curse. Previously, she has heard a voice saying that a curse will befall her if she looks down to Camelot and in those lines, it shows that she is defying the curse by looking down to Camelot with a steady and stony gaze.

That's something your gonna have to yourself with buddy!