Help with Backing Up

Is it communication, or is it that she does not understand the dynamics of backing a trailer? If she is to be helpful, she needs to be as skillful with backing as you are, so it would be best for you to teach her how. Put her behind the wheel, you tell her what to do. Once she learns how to back a trailer, she could likely guide you in standing in front watching the space and the whole rig. But she can't guide you if she doesn't know how to do it.