Try also setting a time limit for completion of each part, such as 30 minutes to complete the map. Set a kitchen timer or your microwave to ring or beep at the end of the time period. Working against a clock may help your daughter stay focused and pace herself without getting bogged down.
You can also pair the timer with short breaks. Knowing that at the end of the 30-minute period she will have 10 minutes to walk around, stretch, or drink a glass of water may also help your daughter concentrate on the work and get it done. When homework seems to take hours to complete, it can appear endless and there may be no motivation to keep moving. Knowing that there is a break around the corner can keep a child going.
Let your daughter's teacher know what you are trying. If you see progress, the teacher may want to try something similar in the classroom. Your daughter's teacher may have other suggestions for you as well.
Talk also with the school counselor. He or she may be able to give your daughter some individual time or include her in a small group on work completion. You may also want to talk with your pediatrician about the problems your daughter has with her concentration and focus.