Yes, it's verbal abuse, it's disrespect and disregard, it's just plain 'ol being a jerk and a bully. It's not illegal in the US. You are choosing to put up with it. You could leave.

You should reconsider marrying this woman. She doesn't even respect you enough to shut her mouth when you ask to be left alone for a while. This isn't going to get any better unless you solve this problem right now with threat of canceling the upcoming wedding. But, I still think, even if she can curb her badgering momentarily, the minute she has her hooks in you, she will get worse and you will be stuck with her.

In the beginning, especially in the engaged stage, people are on the BEST behavior. If this is her best...

Do you want to put up with abuse? Do you want your future children to have her as a mother?