She had gone to sleep dwelling upon her promise to meet Vane at Rosamond's Pond.

Did she mean to keep that promise?
She could not decide.

She had given her consent under a sort of compulsion.

Was it therefore binding?
At any rate if she went to Hampstead the meeting was impossible.
It was this last reflection which made her linger.

Reasons for altering her plans chased each other through her brain.