You can tell her that while she should definitely get to a dr or an ER to get checked out, that it is possible to having bleeding, clots and even cramping during early pregnancy, and still go on to have a healthy baby.
My sister is due with her second son at the end of this month. At 2mo pg, she was sure she was losing the baby. She had bleeding, with major clots and cramping and was really scared.
It turned out that she had been carrying twins, but one was not viable and terminated.
Another friend of mine is due in September, and she has been bleeding and cramping throughout her pregnancy. Her baby is fine, and the drs have told her to take it easy, but that she should make it full term no problem!
So tell your friend, rest, drink LOTS of fluids, and see a dr as soon as possible.
Also, if it does turn out that it is a miscarriage, PLEASE reassure her that they are much more common than she thinks, and it is NOT HER FAULT. One in four pregnancies is just a cluster of cells that never quite develops into a baby, and ends in a miscarriage.
Tell her there are people out here praying for her and her little one!