Однажды мы с сестрой гуляли на площадке с друзьями, мы играли в прятки и моя сестра ушла домой, она подумала что она с нами не играет, а мы не могли ее найти и искали до вечера, я…

Here is the translation of your story into English:

One day, my sister and I were playing on the playground with friends. We were playing hide and seek, and my sister went home because she thought she wasn't playing with us. We couldn't find her and looked for her until the evening. I told my mom that I had lost my sister, but in the end, she was at home.