Who is the tallest 6th grade girl?

There isn't a specific record for the tallest 6th grade girl as heights can vary widely among individuals and are not officially documented. Typically, the tallest girls in this age group can range from around 4'11" to over 5'5", depending on their growth patterns. If you're looking for information about a specific school or region, it would be best to check with local schools or sports teams.