お人形さんごっこって英語でなんて言うの？

ご質問ありがとうございます。

【When we were in primary school, we'd play with dolls often.】
私たちが小学生の頃は、よくお人形さんで遊んでいたものです

Primary school
小学校

Play with dolls
お人形さんで遊ぶ

Often
よく、頻繁に

ご参考になりましたら幸いです。

「小学生の頃、彼女とはよくいっしょにお人形さんごっこをした」は英語で When we were in primary school, we often played with our dolls together もしくは We often played together with our dolls, when we were in primary schoolになると思います。

小学校 - (英)Primary school, （米）elementary school
小学生 - a primary school student, an elementary school student
彼女と - with her
よく - often
いっしょに - together
人形- dolly, doll

・「When we were in elementary school, we often played with dolls.」
（意味)小学生だった頃、よくお人形さんごっこをしました。

<例文>We've been friends for a long time. When we were in elementary school, we often played with dolls.
<訳>私たちは長い間友達です。小学生だった頃、よくお人形さんごっこをしました。

ご参考になれば幸いです。