Помогите пожалуйста! Срочно!! Правильно ли я составила предложения/текст? Какие ошибки?
My sister visited Moscow last week. There is a unique atmosphere. She was a shopping mall and bought souvenirs and clothes. She visited the Ostankino tower and MSU. When she walked at Red Square she met the cousin.
She very much liked this city.

She was in a shopping mall and bought souvenirs and clothes. Скорее всего будет правильнее сказать When she was walking at the Red Square, she met our\her(нашего\ее) cousin.She liked this city very much.