But we don't know what her cycles are like, so we can't say
no, that isn't the problem
Without taking a complete history and doing an exam, we cannot say one way or the other what the problem is.
You see, medicine is not an exact science... We who are in the medical field literally "practice" medicine.
I, as a nurse, or you, as a layman, cannot tell a person for sure what is going on within her body. We don't know, and many times the doctors don't know.
You see, there are people who take us as actual experts... doctors... etc... We have to be very careful in what we say, and how we handle certain situations.
It is very possible that this site, including us (me, you, or anyone who answers) can be named in a malpractice lawsuit if we give incorrect information. By saying "no, that isn't the problem" you are practicing out of your scope of practice, because you don't know this to be fact.
The medical field is a very sensitive field wherein we have to be extremely careful in how we answer.