Hi, Tanya!
I knew a girl from Bulgaria once, we were hanging out for a week or so. Her mother is Russian and farther is from Bulgaria, and she speaks both languages (but her Rusian was worse since she didn’t live here). And it was very tricky to guess what she meant shaking ner head or nodding. Finally I found that it’s easier to change tounge language than body language, because it’s all about reflexes.