a friend of mine had a similar situation, but he just went to the immaigration or visa department, i am not sure of the name, and he explained his situation to the boss there and they were able to find a solution that allowes him to keep the nanny. I am not sure of the details, but i think its worth it to try to explain your situation yo the authorities. Anyway, if you don't find a solution, i know a good live out nanny, she used to work for me but then i decided its better for my family to have a live in one. contact me if you need her services.