Whats wrong with my GF or me... or US?

This is OK. Girls can do that whole multitasking thing where they're thinking about you no matter what they're doing. Guys compartmentalize life and do thing at different times. Like when I'm working, I'm working and I'm not thinking about home life. When I'm home, I'm at home and I'm not thinking about work. I think you guys will be OK, don't go diagnosing her with some medical stuff (unless you are a psychologist), it all sounds normal to me.