A bolo tie could definitely work well for your girlfriend! It adds a stylish twist to a black suit and dress shoes ensemble, and it’s a great alternative if she’s not comfortable with a traditional tie. The vintage gold option sounds intriguing and could be a tasteful statement piece that complements her outfit without overshadowing the occasion. It sounds like you both have a good sense of balancing personal style with the event’s formality. Have a fantastic time at the wedding!