Although technically if the marriage is ended then the wife should go straight back.
But im sure Carmen would find it hard to just fly back unless she has savings.
If you need to work to save the money to get home its highly unlikely unless your husband or someone else complains very loudly to the visa people anyone will come round to put carmen on a plane.
if you do have difficulty getting back i know the goverment did offer help for those who had overstayed to go back, not sure how it works but maybe worth looking into if your stuck for a way home.