I don't know why she has to specify that it is a slideshow of photos of Blakney. It just comes off as creepy and obsessive for someone who is 'best friend.' I think that it is something that you would not admit to doing and would say it was a slideshow of photos on your phone and it was just one of Blakney which happened to be on the screen, and not just a slideshow of Blakney that she happens to have. I don't have a slideshow of my wife on my phone screensaver, perhaps I need to have that now.
I don't think that Blakney would have a similar set up on her phone. I don't even think that it is a romantic thing that Ruby is doing. I could be wrong with Ruby and Blakney and for we know they are a couple. But I get the impression that it is Ruby being super intense with her friendship with Blakney. I almost get the vibe that Ruby is trying to reinforce the friendship by doing things like have screensavers of her as that must mean they are best friends.
I highly doubt they are a couple, because even if they never publically came out the closet, you'd expect that if they were in a relationship we would at least see more of her on the peripheral of Ruby's videos. For example, I come from a super Catholic family and one of my older cousins is a
les. Her 'best friend' comes to every Christmas, wedding, family brunch, and every event in between. Blakney doesn't seem to be involved in Ruby's life on a day-to-day basis, typically only showing up for the once in a lifetime experiences (Holidays, festivals, media events) or events that also include their broader social group (Ruby's birthday party, reunion in Exeter). You'd think if they were in a 3 year+ relationship in their mid-20's that she would be coming over for things like Christmas/new years, popping in on random weekends, and joining Ruby and Claire on their very many, very underwhelming girl trips. Blakeny just randomly being there sometimes, Viva La Marfa. But she doesn't.
We've had more spontaneous Jade cameos this past year than we have Blakeny.