Misscariage - the time it takes.

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My friemd found out a couple of days ago that she miscarried. Scans show the baby stopped growing over 4 weeks. Her doctor has just said give it at least 2 weeks & see what your body does. Am I wrong in thinking they should be doing something now? 
She is asking me for advice on what to do, as I misscarried 3 months ago but mine was quick and painless, so i just don't know. 
Can anybody who's been through a similar situation tell me what advice I should give her please?