That's not normal. I've been a moody psychotic pregnant woman multiple times, and I never acted like that. I've known a significant amount of pregnant women, and none of them take the excessive hormones to that extreme. Assuming that it's her first pregnancy, there is the chance that she is just acting the way she is and saying whatever she feels like to upset you, because she knows that she can use the pregnancy to her benefit. I'm not trying to say that she's lying, I'm just saying that she's taking the moodiness of pregnancy to an extreme. Try talking to her about it when she seems like the she's thinking rationally, and ask her to try to calm things down a little. Don;t tell her that you think she's being extreme. Simply ask her to calm it down a little. Let her know that you support her, but she's saying a lot of hurtful things and you don't really appreciate it.