Merely a sense of dissonance somewhere.
Whatever it was, it had not been there yesterday.

Yesterday morning she had felt no desire to sit in the shallows and throw shells at crabs.
Yesterday morning her mind had been full of that happy inconsequence which feels no need of thought.

Today was different.

Mentally she shook herself with some irritation.

"What is the matter with you ?" she asked.
But the self she addressed seemed oddly reluctant.