I have been in similar situations too. My stutter began when I was a 13 year old and I also remember that we were reading in our English language class. I was somehow able to read through the paragraph but deep down I knew that there's something wrong as I had never experienced a racing pulse and my clarity fading away. After a few weeks I had to give a presentation along with my other team members, I couldn't even read the first word (which was children and I kept repeating "chi") and the entire class including the teacher started laughing at me. It didn't take much time for them to start imitating me whenever they got the chance and used to bring my stutter into every argument or any thoughts I tried to present (even teachers). I couldn't get back at them because I was alone with noone to back me up (as my family also made fun of it then started ignoring it entirely) but I had a teacher who tapped on my back and listened to what I said and told the class to look the other way while I spoke for my presentation. Neither did I know much about her nor did she about me but she was the only one who understood me and supported me when I had lost all hope. So I can't give you any advice on what you should do here as I never fought back but according to my experience being there for your wife and making her feel supported will benefit her the most.