With long cycles like that, she is probably not a candidate to get pregnant when on her period. Ovulation happens two weeks before the period. She might wish to begin charting her periods on graph paper, and counting backwards two weeks from the first day of several months' periods, so she can get a rough idea of when she might be ovulating. Good luck, it doesn't sound like she is pregnant.
It is possible to get pregnant while on your period, but isn't very likely. Most people it takes 2wks after to get preg, but that's just a generalization and deff not everyone. If she doesn't get hers this month, have her take a hpt