Ok Hi I Have A Friend That Will Stay Up

Ok hi I have a friend that will stay up all the way til 4am-6or7am and wakes up 2-4 in the afternoon and is constantly doing it and she's only 12 sometimes she receives headaches which makes her sleep earlier than she normally does u know like around 10or11or12pm and when she does stay up in the morning she gets on her iPad so does she have DSPD OR SOMETHING ELSE