No, of course she couldn't be certain of this.
And indeed she would be sure to let him know at the very first sign of their recurrence.
He looked over his patient with real anxiety, a solicitude from the bottom of which he was somehow unable to expel the last trace of a lingering hope that would have dismayed the little woman--not hope, exactly, but something almost like it which he would only translate to himself as an earnest desire that he might be at hand when the dread indisposition did attack her.

Just now there could be no doubt that she was free from pain.
He thanked her profusely for her courtesy of the day before.

He had seen wonderful things.

He had learned a lot.

And he wanted to ask her something, assuring himself that he was alone in the waiting room.