Not all women eat weird things. Pregnant women tend to crave salt, their blood volume is increasing and holding onto water is important, while of course too much water retention can be a sign of something very dangerous, but that is besides the fact. They have an increased need for calories in general so they are eating more than usual.
Exercise some patience? Well, she does have some things going on beyond her control, you should be empathetic to that. If she were sick would you have sympathy for being less patient? I know people don’t like to equate sick with pregnant, but I think the movement to expect women to be the same as always during pregnancy is an undue pressure on women. Some have trouble keeping up the same pace, they need help. If they already were bordering on being overwhelmed, pregnancy can put them over the edge. It really varies from woman to woman. I know women who had energy, wanted to have sex more often, were in nesting moods and were more affectionate in general. It just depends.