YOU SAID:

And while I do know one Japanese girl, I do not talk to her because she does not understand English very well and types mostly Japanese.

INTO JAPANESE

そして、私は一人の日本人の女の子を知っていますが、彼女は英語をあまりよく理解しておらず、ほとんどが日本語をタイプしているので、彼女とは話しません。

BACK INTO ENGLISH

And I know a Japanese girl, but she doesn't understand English very well and most of them type Japanese so I don't talk to her.

INTO JAPANESE

私は日本人の女の子を知っていますが、彼女は英語をあまりよく理解しておらず、ほとんどの人が日本語をタイプしているので、私は彼女と話をしません。

BACK INTO ENGLISH

I know a Japanese girl, but I don't talk to her because she doesn't understand English very well and most people type Japanese.

INTO JAPANESE

私は日本人の女の子を知っていますが、彼女は英語をあまりよく理解しておらず、ほとんどの人が日本語をタイプしているので、私は彼女と話をしません。

BACK INTO ENGLISH

I know a Japanese girl, but I don't talk to her because she doesn't understand English very well and most people type Japanese.