oral hsv2 is not common. If she has a stablished genital infections then it would be highly unlikely that she could transmit through oral. Viral sheading of oral hsv2 is estimated at 1%.
Yearly Transmission rates from female to male in couples that have unprotected sex vaginal twice a week is 4% you add condom and that is reduced to 2% ad antiviral meds and that is reduced to 1%