How many days to improve gastritis with omeprazole?

I have a 9 year old daughter and for 7 days she has been suffering from gastritis, I have been giving Omeprazol to her for 3 days, it takes a long time to heal, how many days to appear an improvement?
Expert answer:

The response to treatment in the case of gastritis is usually immediate. How was this diagnosis made? Who prescribed this medicine for your daughter? You should see a doctor first.

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