How wonderful. Thank you so much for posting that article, Michael. It is fantastic to lay eyes upon the elusive Miss Evans at last. The article concerning the endowment of the church organ by the Evans sisters can be found in the archives of The New York Times. I stumbled across the full text during my own internet meanderings last year but foolishly neglected to take the date and page references.
Re-reading Archibald Gracie's very lucid account, it is clear that he did not in fact know Edith personally before the voyage, and was only introduced to her by the Lamson sisters when the ship was sinking. I don't have my copy of Gracie's text in front of me as I type this - but I recall quite clearly that he states that he missed Edith's name upon their initial meeting and had to ask her to repeat it to him at a very late stage, when the situation on the sloping Boat Deck was becoming increasingly precarious. So, however Edith was spending her time between 10th-14th April, her activities did not bring her into contact with this most gregarious of men.
There has been endless speculation on this forum as to why Edith did not enter Collapsible D with Mrs Brown. It has been posited that she may have worn a modish and restrictive hobble-skirt which prevented her from negotiating the gap between deck and boat. This is certainly a possibility. However, I've come to believe that, without any active intent on the part of the men in charge of the loading process, and in their haste to get the collapsible safely away, Edith's presence in the waiting throng was simply and conveniently 'overlooked' - understandable, given that the Titanic was about to founder, but not a fact to be easily reconciled with the myths of selfless male gallantry perpetuated that night (only think of Steffanson and Woolner leaping into two empty spaces a matter of seconds later!)
One way or another, I suppose we will never know.