In ch. 10, she tries to allow him and Harriet time alone, yet never attempts it for herself. In ch. 15, Emma does begin to fear that Mr. Elton has 'transferred his affection' from Harriet to her the night of the Westons' dinner party, wherein many of your clues originate. She is not totally blind. But as he becomes more obvious, he also refuses to see that she is signaling that she is not in the mood to accept him. She tries not to talk to him, she glares and leaves when he assumes a lover-like right to be concerned over her health, she is distantly searching for a bland topic when he decides to throw himself at her... Even when she refuses to listen to him, he insinuates that she knew he was vying for her the whole time. Was the end of all that the wine, or was he really convinced that her 'no' meant 'yes'?