Hi there,
I just entered the US at DFW on March 2nd and fortunately for me everything went well even though I had to wait for 2 hours and the inspection room.
I am a LPR, I stayed 11 months out of America because I was in grad school in Spain and had a baby in Germany. The baby was 4 months old and it was the first time that both me and baby came back to the US after her birth.
When I arrived at the POE, the officer was very friendly. He asked me what did I do abroad, how long did I stay there. So when I told him 11 months, he told me "you need to be careful, can't go over a year, ok?"
After that he took me the room, got all my baby doc, after 2 hours, he came out give me back the original German Birth Certificate but he kept the original International BC and city BC or something, he did make a copy of those 2 for me though. He said once USCIS verify all the info and the baby GC is issued I should receive those back. Then he gave me her PP with a stamp on it that say its a temporary I-551 and he wrote NA3 on it. I asked him whats next and he said his job is done here and I would have to contact USCIS for further questions, and I should call them if I don't see her green card coming in 2 months or so. So its been a bit over 2 months and I did make an appointment with USCIS next week to find out whats going on since I haven't heard from the.
So, in your case, I think your wife should definitely apply for a return visa since she has been away for more than 1 year. They are very strict on that 1 year rule and it is a big risk that your wife and baby would be denied to enter at POE. Since you have a job offer in the States, it would help her case as well. As long as you can explain to them why she had to stay out for more than 1 year, you should be good.
Let me know if you have any other question. Good luck!