My friend

I am very happy for my best friend who just had a baby, a boy. She is my best friend, but I can't to see her now, she is in another city, and I hope everythings go well for her. I am very happy for her, it's not easy for a woman, this must be the most imporant thing in her life. I hope to see her soon. I am so excited now, I dont know why, maybe for her, I guess. She has become a mother!

短文写的不错！英文的“我”一定要大写成I，以区别于字母。标点后面有一个空格。

My Friend

I am so happy about my best friend, she's just had a baby and it's been a boy. She is my best friend, but i can't to see her now because she is in a different city. I hope everythings is going well. I am so happy for her, it's not easy for a woman, this must be the most imporant thing in her life. I hope to see her soon.I am so excited now and i don't know why. Maybe because of the news, I guess. She has  become a mother!

Hope you will see your friend very soon!

My friend

I am so happy for my best friend,she just had a baby,it's a boy.She is my best friend,but i cant to see her now, because she is in the a different city. and I hope she everythings goes well for her.I am so happy for her,it's not easy for a woman (it's not very clear WHAT is not easy for a woman, having a baby? And it doesn't flow because you just said you're happy for her),this must be the most imporant thing in her life.I hope to see her soon.I am so excited now,i dont know why,maybe for her,i guess.She becomes a mother!(She has become a mother, She's a mother now, She became a mother, 都可以)

And listen to what 1964的 said about capitalization and spaces after punctuation marks, I didn't bother to correct those here.