Helping her with her assignment "WILL BE" a huge plus for your R with her. When my wife was in college (which was very important to her) she asked me a few times to help her with some assignments. I, told her I am not the one who is going to school, I do not want to do your assignments (what a complete jack ass and moron I was). Well needless to say when every we talk about what has gone with our M, the college events come up. She uses them to show me how big of a jerk I was and how very un-supportive I was. And you know what I can not argue with her about it, because I was.
So, I say help her out even if you feel it is not fair and you would rather not. Think of it as taking one for the team, the relationship team. It will do wonders on her feelings toward you. And if you don't it will be several more nails in your R's coffin.
“Do you want to be RIGHT or want to be LOVED” “You have to have a life to share a life with someone” “When you stop resisting, you start learning”