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I think it is her first issue.(primi gravida)
Usually primi gravida can feel the fetal movement around 18 to 20 weeks.If she can not feel a single movement for about 72 hours one ultra sound should be done to see the condition of the fetus.
Advice her to lay down in left lateral position for 1 to 2 hours to feel the movement.
Ithink she will have it.
At this early stage it is sometimes difficult to feel the fetal movement by the mother though the fetus is absolutely ok.
So dont worry.