http://www.pcworld.com/article/2901262/microsoft-tightens-windows-10s-secure-boot-screws-where-does-that-leave-linux.html
It's really bad that M$ controls hardware manufacturers, but they've been doing it for subtle ways for years. According to that article, you're stuck with Ubuntu or Fedora for now on latest hardware where you can't disable secure boot.
I run Ubuntu (14.04) on my desktop and Linux Mint Mate (17.1) on my laptop. I'm not a fan of the Ubuntu Unity interface and I got lucky on my desktop as I kept upgrading from an old version that originally had Gnome and it somehow keeps it around.
Has your wife tried "gimp" on linux as a Photoshop alternative?