Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
Stomach virus is contagious.
It enters the body through mouth, as from food, drinks.
However, you need to remain cautious even after the stool gets normal.
Sometimes the patient remain infectious after recovery.
It can be several days to two weeks after apparent recovery.
Particularly children continues to pass it longer.
So please continue to take precaution.
Washing hand frequently, after using toilet & before taking food is a good way to prevent its transmission.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish her healthy life.