I find it amusing, but I do not require legal representation. Upon my arrival in the United States, I completed all necessary documentation independently. I will prepare the application for my mother and save it for her. Subsequently, she will log in, sign, and submit it. The guidelines indicate that while someone may assist in completing the application, the individual who will attend the interview must provide their own signature. Although I considered signing on behalf of my mother, as your wife did, I assure you that it is not a significant issue.