Josephkd

Plenty of us have been down these roads. It seems as you say but it can be simplified & you are in the right place for help. Keep in mind no one here knows exactly what will happen in her case but we can predict fairly well.
Step one is the initial application which is pretty easy. The case is unique as they all are. Here on the surface it seems like they would understand the culture at her embassy for example. This would then seem to insure success. But what must be considered is not why she wants to go but what compels her to return. That must be defined and presented to be granted the visa.
If granted she attempts entry into USA. Its at that POE where they assign the length of time she can stay & actual entry. This is where they wont understand the culture. That doesn't mean she wont get in; just that she will need to know how to answer the simple questions. This is easy because she just tells the truth.
Your only a guest here if you think you are. I became a citizen too & I assure you I am not a guest. Like all of us you just need time to relax into a new life maybe.

She applies for the B 2 on her own merits. She must understand that the most difficult aspect is meeting the strongest ties rule which mean she must prove beyond doubt that she MUST return. This can difficult to do & requires thought.
Keep in mind that these cases are often decided before the person ever steps up to the window to interview. This means she must find a way to present her proof with the application if possible.

The OP was looking for a visa where she wouldn't have to go back home afterwards therefor the tourist visa with the intention of marrying and staying would not be a good suggestion. The OP has opted to go with the K1.

It's not like that.
It's wrong to go to the States on a tourist visa to get married AND stay.

So she won't be able to go to the states to see your family before than? Can they go visit the two of you? Then you could start the process earlier