when your partner develops oral herpes, performing unprotected oral sex may spread the virus to you. Even she doesn't have outbreaks of oral herpes, you still have risk to cotract it, but the risk is low. I think protected sex with condoms will be good for you
If she has only oral hsv then you are at no risk giving her oral sex. If you do not have any hsv then you are at risk recieving oral sex.