It's not how tall she grows, but how steadily she grows.
This is a growth chart for an infant girl from birth to 36 months. The chart is based on the growth patterns of thousands of babies to determine what is "normal".
At 55 cm at birth, that would place her above the 95th %ile.
At 71 cm at 13 months, that would place her just at the 10th %ile.
That means she had "dropped" more than three percentile groups or "crossed" more than three percentile lines. That is considered by most physicians to indicate a problem.
With the newer WHO growth charts available here, the same phenomenon occurs.
(You can see that her weight is a different matter.)
You should definitely discuss this with your doctor.