I'm a strength coach for multiple high school teams, about half of which are girls teams. There are only a few differences between my girls and guys programs, none of which are huge.
-Using eccentrics and isometric holds for chins until their strength progresses enough to get adequate volume.
-Regressing lifts until adequate strength is achieved (barbell push-ups, goblet squats etc.) This usually only lasts a couple weeks.
-Really hammering jumping and landing technique (this applies to guys too but girls tend to need a little more).
All these can also apply to guys that are beginners.
The main difference I see between the girls and guys is that guys try to impress me by moving more weight while girls try to impress me by doing shit right and the way I want it done. This makes them infinitely more coachable and makes me look very good.
Helping females reach new levels of physical and mental strength is awesome, good luck to you and your girlfriend.