Welcome to the forum and welcome back into the fold of firearms appreciation and enjoyment.
From your list and prices, I would opt for the SP-01. As I have stated here before, my SP-01 Tactical is the least favorite CZ handgun that I own but it is still a nice firearm. It seems a bargain compared to the others you list and it sounds like you will be using it for fun and not competition.
I have a Shadow 2 that I bought “used” (it had not been fired, the previous owner bought 2 of them for some reason and sold the other one...hate to tell you (OK, I guess I don’t) for $900.00...came with a set of Lok grips too.)
Anyway I think the Shadow might be a poor choice if your girlfriend is unfamiliar with shooting. The trigger is very light from the factory. I have probably only shot several hundred rounds through mine but have had several times when I unintentionally fired a second round, simply because the trigger pull is so light. No safety issue as it was, of course, still pointed down range, but I could see where that could be a frightening experience for someone new to shooting.
Good luck and enjoy your re-found hobby.
Your screen name is a bit confusing to me, NoCompromise, seems living in Kalifornia is a compromise...compromising freedom for whatever. I don’t mean to rip on you, I just found that a bit incongruous.
Be safe, have fun!!