If the woman had not seen pubes in her food, she would not have suffered an emotionally traumatic flashback.
That is an assumption that again, is impossible to prove! She could have gone into washroom, seen pubic hair on toilet or sink or floor, and had emotionally traumatic flashback there.
The legal test is: what is the reaction a "reasonable" person would have to same situation. It is not: what is the reaction a person with post traumatic stress syndrom would have. For instance, flashbacks are often triggered by scent of shampoo or cologne that abuser wore. Should woman be able to sue manager of restaurant if she smells same cologne he is wearing or they use same soap in bathroom as her abuser used and she has flashback? Of course not, it is not reaction a reasonable person would have. It is reaction of person with psychiatric illness. Is society expected to alter realty and entire world to sensitivites of few mentally ill? It is impossible and unreasonable.