Henry Tilney must know best.

She blamed herself for the extent of her fears, and resolved never to think so seriously on the subject again.
Her resolution was supported by Isabella's behaviour in their parting interview.

The Thorpes spent the last evening of Catherine's stay in Pulteney Street, and nothing passed between the lovers to excite her uneasiness, or make her quit them in apprehension.

James was in excellent spirits, and Isabella most engagingly placid.

Her tenderness for her friend seemed rather the first feeling of her heart; but that at such a moment was allowable; and once she gave her lover a flat contradiction, and once she drew back her hand; but Catherine remembered Henry's instructions, and placed it all to judicious affection.