Well, yes, time and space are essentially the same thing. That's why they're commonly referred to as "spacetime;" moving forward through time is essentially stopping your own movement through space while the rest of the universe continues on, and moving backward through time is stopping your movement through space while rewinding the rest of the universe's. (So every time machine is also a space machine. Think about it - if the DeLorean from Back to the Future really just moved through time, the chances of them ending up in the cold vacuum of space after every time jump is extremely high since the Earth would more than likely be in a different space.) A person with super speed isn't really faster, they're just able to reduce the relative space between them and wherever they're trying to get or otherwise slow the advancement of space relative to them. Any faster-than-light travel we could ever hope to accomplish runs on this principle - don't move faster, just reduce the space between points A and B.
For the purposes of a layman's explanation of a time loop's origin, though... best to just stick with the "who knows?"
Time is relative. From our perspective the first time we met Mide, she had already died... in our past, which is her future. Unless we gain the ability to move through [space]time ourselves we'll never meet her again, because she is born, lives, and dies as a cog in Alexander's temporal loops.
Mide didn't die at 26, but from our perspective she has been dead a long, long time. Time travel is wonky like that.
EDIT
Humor can be hard to convey through pure text...
