Just tell you play poker straight from the beginning and tell you make tons of money. Dont try to tell her bad beats, loosing days or shit like this. Hide them all. Seriously, if you can barely handle variance, how can she handle? Overall girls are so weak at this point. Just stop whining and be a mindset pro.
When you are playing just tell her you are working and she is at your office. Either she brings you coffee, or she GTFO.