A Dream came true

Alli is 15 years old. She's going to high school and she has a lot of friends. When she was younger her grandma told her fairytales about everything, but especially about dreams. They talked a lot about her dreams and they were like best friends. But one day her grandmother died and Alli got very depressed. Her grades were getting worse and worse, but then, one day, a dream came true.

I am not a native speaker! That's why my English is not as good as the English of a native speaker. I'd be glad if you correct me, because I wanna learn and I think you could help me better than my teacher. bye bye.