That's what I thought too. The guy who interviewed her was actually really impressed with her, and I expected him to basically swear her in right then and there but he didn't. I just assumed that he didn't because it was right around the time that the administration was about to change (this was in December right before Trump took office).
No my mom has never been in legal trouble in or outside of the us. She certainly has never claimed to be a US citizen either. I suppose I can understand if they were looking at her long history in the states, but that doesn't make much sense given that some of her friends who did get their citizenship in the same time at the same office have been in the country for about the same amount of time too. She has two sons, I'm one of them and both of us are dual citizen and her ex-husband, my father is an American. I'm thinking about suing them, but I'm going to try and exhaust as many avenues as I can, I found some resources that told me that I haven't done that yet.
I was reading the post on here about filing yourself, and I think that's what I'm going to do after I exhausted the other couple of resources. Generally these cases don't go to court, but obviously somebody has dropped the ball here.