How good/bad is your Russian right now?
By 5 you should have been somewhat fluent in Russian, so you probably half way bilingual in your brain
You just need practice, I think
We are in the close time zone, so we can do skype if you want, but 11 days isn't gonna be enough

BTW my daughter is Dasha and I'm curious how people call you in school. Do they call you Dasha or Darya?


PS: That's why I have "Russian language only" rule in my house