We came to Germany when my elder daughter was 6 years old, and we are living in Germany for two years because of our work as a missinory. Now my daughter is going to German school and can speak German and write German... But may be this or the next year or the last to live in Germany.
I am worried of my daughter... if we move from here to UK than again she will not be able to study Englis and it will be very stressfull for her.
What should I do?

Can't she speak and write english now ? In the UK she will learn both.

I have the same problem.
I imigrated to the US 11 y ago, my kids both understand German , but refuse to speak it. I trust God that He willl work out all things. I know it is all there. It just need to be triggert some how.