hi, I'm sorry for what she is going to go through
I also had this happen to me with my first pregnancy. I was not familiar with OBGYN issues at that time and the Ob did not clearly explain to me what's going to happen and why.
Please assure her that it is not her fault, that it is a freak accident of nature and she is most likely going to have a normal pg next time around.
i had a natural miscarriage, very painful, but I was glad to avoid D&C.
She will need lots of support from everyone in the family and just ask them to be sensitive to the issue. Sometimes people say things " it's not like it was a baby anyway '" or " you'll have another baby", they mean well, but it only adds to the greif. For me it was a baby right from the start, even though it didn't develop.
Don't worry, she will be ok.