Its fun to tease about our partners (DW) and their tendencies to be of limited help in backing up. Some have found (including me) that females are often better at finesse tasks such as backing up a trailer than their male partners--assuming you haven't repeatedly told them that it is something they cannot do.
Remember, some day you will be too old to do the driving. Your options may be to either quit camping or to rely on her to handle it. If the latter is preferred, you may want to make sure she has the confidence and skills that YOU are going to need her to have.
Keep camping.