If her vagina is not breathing it's time for first aid. Like a person that isn't breathing place your lips again her vagina lips and use your tongue to hold vagina open and then breath heavily into the vagina till she like someone that is recusitated with make a bunch of grunting noises and moving around. Then you know you performed it properly, if not try again and again and again till you hear grunting and do it a few times more to be sure.