My little niece

I have a little niece. She is 1 year and 11 months. Her name is Polina. She is very beautiful. She has light-blue eyes, blonde hair and an amazing smile. This girl is funny, friendly and so clever. She understands everything that you say to her. When you see her, you can think that she is very obedient, but it's false. Polina likes to do everything - little pranks while her mother than it is busy.
Also, she likes to play with cats and little chickens. She can see animals at the farm of her grantparents.
I think when Polina grows up, she will help her grandparents and will not do pranks.)

[Good job.  Russians always have a hard time with English articles (a, an, the) because Russian doesn't use them.]