Tree,
I'm sorry about your friend. I've noticed people come in and out of my life for various reasons. They come are here for a time - and usually it a very good time, and then they aren't.
Things happen for a variety of reasons, some of which we are privvy to, some of which we can only guess.
I say try to hold onto the good times you had with this friend, but recognize that she has to do what she has to do.
I think your dream is telling you that what you have right now is enough without her.
The unfinished masterpiece (which I interpret to be you), is well tended, with the artist in residence (the church) so to speak.
The infirmed queen of england, well, I don't know about that. Perhaps you are worried about Prince William's upcoming wedding



.
Enjoy your vacation.