If you look at her pictures, she's a good sized baby- but IMO the stats are off. My guess- the parents have the 9mo weight and by way of a guess added what they thought she might have gained in almost 2 months.
By CDC growth chart, a baby who was 22 lbs at 9 months would be 24.5lbs at 11 months if they stayed on their same curve. Someone who wasn't familiar with the slowed rate of growth would probably say "She was 22 lbs at 9 months, if she gained 3 lbs a month she would be 28 now. But the only expected amount of growth was 2lbs.
Not to mention, 9-12 months is a time many parents of larger babies see a decline in growth rate because the child becomes more mobile and thins out but continues to grow in length- for example, I have one who was 20lbs at 4 months and 25 lbs at 2 years. It's not uncommon.
ETA source:
http://www.cdc.gov/growthcharts/data/set1clinical/cj41c018.pdf