And this is why it is not a good idea to point it out... my experience (which is extensive 'from the other side') is that the best course of action is to not mention it, let her get on with whatever she needs to do, take the 'slings and arrows' in good grace as and when needed (you can store up the bad karma to throw back later if you like, but punishment during the period tends to be a bad idea - this is time for caring Dom not stern Dom) and basically ride out the storm. If she mentions it, then discuss it but keep the caring vibes on.

And I do repeat my advice from earlier - if the symptoms are really unbearable, to the extent you cannot live a normal life and are in fact taking time off work for it, a doctor should be seen as there are ways to minimise it a lot. Trust me, I have seen this to be true in person.