I have a character in a short story that I'm finding it difficult to refer to as anything other than "her" or "she". She plays the part of the wife of a murder victim who is being interviewed by the police and will by the end of the story be a major part of the twist. Due to the situation and the formality of her involvement, the MC - a police detective only refers to her in dialogue as "Mrs Russell" and I don't feel it would be right to address her like this outside of the dialogue. This leaves me repeating "Her" and "She" an awful lot. Is there a way to get around this, or is it generally acceptable? I've thought about trying to slip a first name in there, maybe as part of of the MC reading her file and discovering her first name, but I think this would confuse the reader and give the narrative too much of a relaxed feeling.