IF you contracted herpes from her AND it was the case that she knew that she had the disease at the time, then you may have a valid claim or lawsuit against her, to recover medical costs and "pain and suffering" for the impairment of your life. If there was no injury (i.e. you didn't catch anything), there's no point to a lawsuit, since you could not recover any money (the law only compensates for actual costs or injuries, not potential ones); or if she did not know she had the disease, there is no liability, since in the absence of knowledge, she did nothing wrong.