I'm fed up when my girlfriend asks questions that can be easily googled
Do you think she wants to hear your opinion, and not Googles?
She assumes I know everything and that's why she doesn't Google her questions.
Don't get upset with your girlfriend for seeking knowledge. Maybe asking you these things is how she communicates.
Yeah right. I think she's just wasting my time with these stupid questions. I should be focused on more important things.
Have you considered that maybe she asks you because she holds your opinion in high regard? You shouldn't get upset with her over something so trivial, if it's bothering you that much then just explain it to her. This doesn't seem like something worth fighting over.