how can I export a full sized, full resolution photo from Photos?
Background:
I am a very literate Mac user but have NEVER used iPhotos or Photos - initially because I didn't like how they seized my photos and hid them in a location that it took an expert user to show me where they were.
Meanwhile, my cousin who is 77, has all her photos in Photos. They were originally in iPhoto but after its database became corrupted and all the photos "disappeared": she spent several hundred $$ at an Apple store for them to create a new database as well as find and restore all the photos, (of course all her events and albums had "disappeared" in the process) She ended up with 6 to 7 duplicates of many of her photos and was told to go home and delete the duplicates which she has been attempting to do. (her original 3000 photos became 15,000 photos after the "repair")
Meanwhile, she would now like to export a couple of full-sized, full-resolution photos to her desktop so that she can upload them to be printed. Could someone guide me PLEASE to a quick and easy tutorial on how this might be done? I will go over to help her do this tomorrow and could probably figure it out - but it would be very nice if some kind person could just tell me how to do this for her.
thanks you and Season's Greetings to all of you.
MacBook Pro, OS X Yosemite (10.10)