Lady D I know you are upset, but please don't let your daughter in law think you are blaming her. You mention that "too bad she didn't have the shot earlier in the pregnancy," but the average mom-to-be doesn't know a thing about Rh incompatibility, nor should she be expected to. Also, if her blood type is positive, why would she think the baby's might be negative? Usually the concern is when the mother's type is negative.
The shot they gave her *may* have been because they were concerned that because of the loss, she now has antibodies in her blood that could be a risk for a future pregnancy. I can tell you it happens because I have some hemoglobin antibodies (from an earlier pregnancy where the blood got mixed together) that have required me to be monitored throughout this pregnancy for any danger to the baby. I have had monthly blood tests and ultrasounds and all is well, but they are just watching to play it safe. About the only thing a mom-to-be can do is make sure she gets the best care available, because the doctors are the ones who have to make these decisions.
As far as whether she is too stressed-out, well, it is possible that stress may have been a factor, but from what I have read it is more likely that the miscarriage was caused by some defect in the fetus or its environment in the womb, which again is *not* her fault. The last thing she needs to hear is that she may have somehow been a cause. She is young and has plenty of time; the most important thing is she needs to work through her emotions first. I hate to sound glib but I do come from experience. I had difficult fertility issues with my first and two miscarriages but three successful pregnancies. BR's story illustrates that not everyone gets so lucky

but at the same time your daughter in law can't go into this thinking she is helpless. She and your son have many years to create their family.