About 80 pounds
depends how tall she is...
How tall are you
The average weight for a 13 year old girl that is 5 foot tall is between 90lbs to 100lbs.
55kg
it depends on how tall you are, not really your age
80pounds
what is average weight for girl of 139cm tall
90 lbs.
18 kellogram
6 1/2 stone
4 stone
37.4 lbs.