when she replies to her mother's accusations of;

"Is he not a man of honour and feeling? Has there been any inconsistency on his side to create alarm? can he be deceitful?"

Elinor's words of;

"I hope not, I believe not," cried Elinor."I love Willoughby, sincerely love him; and suspicion of his integrity cannot be more painful to yourself than to me. It has been involuntary, and I will not encourage it...."

I find that this outburst of Elinor is more to satisfy her mother out of desperation, and also because she feels a bit hurt at her mother's accusations.

I cannot imagine Elinor would find that self centred farewell speech by Willoughby as arousing good opinion about him.

I don't think Elinor loves Willoughby at all, because she has all along been seeing things which were not very praiseworthy.