it makes my stomach hurt just reading this because I too went through horrible pains...
i went to the doctor and they told me they did a test on how bad my cramps were and they rate it on a scale from one to five and mine was a 5++
they actually put me on birth control but told me not to take the last week and sooner or later it stopped my period...now i have found out that stopping my period wasn't the healthiest decision eventhough the doctor told me it was OK if i had a certain something in me...like a protein or a vitamin or something..
anyway
now my peroid is never on time..it is just now starting to become normal and this happened when i was like 15 i am now 21
so my advice...is the pill is good..just don't stop her period....and warn her that the pill changes you....like your wieght and attitude
and as the parent give her a little leeway on things because she isn't gonna be herself