To the first point, I understand that things are generalized, but the way she was saying it, she was stating fact and she thought there was NO way the LP could be any different. So, if they are generalizing, that was lost on her
As for being a student, yes, thankfully she is still one. However, I've heard of many nurses in OB offices who think/tell this exact same thing. I've heard plenty of these stories on this board and from a particular friend IRL.
This is what we are taught, all of us. It is the medical standard. Why would a general RN have to know in DETAIL every part of the cycle, average lengths, and issues?
I promise you, if a question on her NCLEX came up about Ovulation. She needs to put 14 days prior to next period. This is how they base the EDD. Who knows, her teacher may have said this is "generalized", but like a temp of 98.6, people freak out if the temp is not 98.6.
This is what I learned in nursing school too. Guess what, I knew better. And unless she is going to be in pre-natal or reproductive services, it is ok. Even L/D doesn't matter, they are already prengnat by that point.
Just smile and nod. It's ok.