If she can remember that at such times even though she may be very hungry, her body is better nourished if she takes slowly a cup of hot milk, and waits until she is more rested before taking solid food, than if she ate a hearty meal.

It will save a strain, and perhaps eventually severe illness.
If it is possible to rest and do absolutely nothing for half an hour before a meal, and for half an hour after that insures the best work for our digestion.

If one is pretty well, and cannot spare the half hour, ten or fifteen minutes will do, unless there is a great deal of fatigue to be conquered.
If it is necessary to work right up to mealtime, let up a little before stopping.

As the time for dinner approaches do not work quite so hard; the work will not lose; in the end it will gain--and when you begin work again begin lightly, and get into the thick of it gradually.

That gives your stomach a good chance.
If possible get a long rest before the last meal, and if your day is very busy, it is better to have the heartiest meal at the end of it, to take a good rest afterward and then a walk in the fresh air, which may be long or short, according to what other work you have to do or according to how tired you are.
I know many women will say: "But I am tired all the time; if I waited to rest before I ate, I should starve." The answer to that is "protect your stomach as well as you can.