Oh! That's such a Fun question!! MianMian is fluent in Mandarin(her home language); English and some words in Turkish!! by Step 1 since her old school.
In Step 2; she starts to learn some German(for my girl Tamarack🩷) and Russian; here, she's already fluent in Turkish too.
In Step 3 she becomes fluent in German and Russian, then she begins to learn Korean and starts to get interested in Tagalog Filipino too.
In Step 4, she likes to mix words in diferent languages to play with her friends (usually Korean+Filipino Tagalog+Mandarin); she likes to study diferent kinds of languages, but doesn't learn more in this step.