Thanks for the query.
You didn't mention why she is taking duphaston
If it is used for delayed menstruation
, after using it for 5 days, it will induce withdrawal bleeding.
If the duphaston is prescribed in 20 to 25 days course etc. to regulate the periods, then the bleeding she had could be breakthrough bleeding
So you once consult your doctor discuss these possibilities and follow her advice.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429