Does Alpha love or admire Sid/Shadow?

I’m an anime only. But I’ve read part of the novel which covers the upcoming movie.

One of my favorite episodes of season 2 is episode 26 with Alpha vs John Smith. I didn’t fathom how much love Alpha seemed to have for Sid. I’m just curious. Why? What makes her so drawn to him?

I plan on reading the novels later but would love to be spoiled.