My 13yr old has had her first true menstrual cycle. its now going on 12 days, it has lightened up, but she is still bleeding. no other s/s. is this ok?

It happens: Often the early menses of teens are the result of several months of estrogen stimulation. When the uterine rhine breaks down, it is not limited and may take a while to finish.After about 6 mo most start to release eggs, creating a more dependable clock for buildup/release. Several weeks between cycles or irregular timing is common the first 6m -1yr.