Adding our experiences (because reading all your alls good experiences really helped our nerves!):
- My wife is Chilean, we all live in Chile
- She used to be a GC holder through our marriage, but we moved to chile about 4 years ago, and now are in process to move back to the US
- She applied for and got a 10 year B2 visa last december, she had overstayed by a couple weeks on accident as a teenager, so that is why she couldnt use ESTA and had to apply for a B2 visa. We had not applied for the I-130 at that time, but she did have "risks" of being married to a US citizen and having 2 US citizen kids. But there was no issue with the approval of her B2 visa.
- We all entered the US in April through JFK (before applying for the I-130): the CBP officer was a very harsh with us becase we all went to the US citizen line (because we asked and they told us to), but she said my wife wasn't a citizen and shouldn't be in this line so she chewed us out a bit. My wife was then called to the back room and another officer was super chill and just asked her about the ESTA thing and her old green card, and then let her pass through without problems.
- We visited the US again just now in October through LAX (after applying for I-130), we were going to go to the visitors line as a family to not repeat the problem, but they saw us and said again we should go to the US citizens line as a family. This time the officer was very nice and only asked if she was a GC holder or not, and how long our stay was. Took our pictures and passed us through. Didn't mention anything about I-130, old GC, or ESTA issue.
I do think each additional visit she makes and comes back to Chile will make it easier and easier for the CBP to pass her through. So we were very happy with the last visit!