Many women are at no greater risk of having another loss than anyone else in the population. As for any feelings of guilt, I think most women should know that it is very unlikely that they did anything to cause the loss. She is not necessarily considered high risk although that definition is used in different ways by different people. As I mention, I was not considered high-risk despite my late loss, and many women will not be considered high risk either. Other reasons for a high-risk status include someone with a history of placental problems, such as placental abruption or someone who has had two or more miscarriages already.
Some people like to say that ignorance is bliss.
Well, that bliss is gone for a woman who has lost a baby. She knows that nine months of pregnancy do not always end with the birth of a healthy baby. But I think that mixed in with that fear is hope. If we didn't have hope, we probably would not even contemplate another pregnancy. Of course, all of a woman's grief does not go away just because she is pregnant again.