She hasnt had her period since august last year it was her first time and she hasnt gotten it again it lasted 10 days?

The young lady should be examined by her OBGYN to diagnose any underlying conditions.

Menses in the first year is often erratic with variable flow. Many are not releasing eggs at the beginning, which is important to setting a normal paced cycle. Skipped menses usually means an estrogen dominated system that builds for wks/months before breaking down with heavy or prolonged bleeding.After 6m/1yr it usually self regulates. Your doc can confirm it if desired.