On a cold day, Ernie, a poor homeless little girl, was selling matches to make a living.

This is OK. It may be more natural to say, "On a cold day, a poor homeless girl named Ernie was selling matches..."

However, selling matches did not bring herin enough money to eatfor a decent meal.

Ever since she lost her parents, Ernie had lost a lot of weight and looked pale as if she was falling down since she lost her parents.

I think this should be, "She looked pale as if she were falling over." But I'm not quite sure what you meant, so I kept it the same.

Ernie thought to herself, "If the governor was a good person, everyone would be living  happily."

The governor imposed a high taxation on the people in the city and collected money to enjoy big parties with the rich peoples everyday.

No matter how much the people worked, they still were poor.

I added "the" because you're talking about the people who live in the town. It's a specific group of people, so it seems more correct to add the definite article.

If someone resistsed the governor, the person will be caughtould be arrested by the police and imprisoned to death or killedor sentenced to death.

Zoe was a beautiful and kind girl, but she became a lover of the governor instead's lover to pay off ther parents' debts.

Based on the context of the story, this is what I think you meant.

Ernie went to athe mansion house where Zoe was living in.

A mansion is a type of house, so you don't need to say house here.

Zoe came out from the house and gave a bun to Ernie and said,. “Take this and go to a warm place.”some place warm,” she said. Ernie foundsaw some scars on Zoe's face.

It's more natural to say "Go find some place warm" or "Go find somewhere warm."

Those scars letmade Ernie preassume that Zoe had been hit by someone.

"Scars," Ernie said, “Scars..”. Zoe quickly hid them with her hairs and said, “They are nothing, just because of. I got them from falling down.

Go and look for a warmsome place warm.

ThaIt was a baby of the governor's baby.

You could combine these two sentences.
"Zoe was pregnant with the governor's baby."

“Never mind.

This is fine. But personally, I would say "don't worry."

Go to a goodsafe place.

Zoe gave a bun to Ernie every day like this.

Everyday (no space) is an adjective, so it has to describe something. Every day (with a space) is a noun.

Ernie knew that Zoe didn't eat a bun to put it awaycould have eaten the bun but didn't so that she could save it for Ernie everyday.

Since you said every day in the previous sentence, you don't need it here.

As soon as Zoe got back to the house, a big car came there.

ThaIt was Mrs. Cadabby, the governor's wife.

When Mrs. Cadabby went in the house, all the girls stood in line side by side and greeted,. “Good afternoon, Mrs. Cadabby,” they greeted.” Zoe got sick and feltl down there.

When you say that they stood side by side, the fact that they are in line is already implied.

“Uh, oh!

Zoe, are you all right?

In dialogue, it is often written "alright."

I heard that you have beenwere pregnant.

Is that true?” Sshe asked Zoe sarcastically.

If the word after the quote isn't the start of a new sentence, you shouldn't capitalize the first word.

Oof!” Zoe hid her mouse with her hand.

Does Zoe have a pet mouse? If not, I'm not quite sure what you mean.

“All right, then, i. If you are not pregnant, it is okay toIf I do this, right?”

Mrs. Cadabby kicked Zoe in her's belly up with a tip-toe shoe.

Often, when talkin

“Owww!!!” Zoe screamed and vomitted, having convulsionsng.

Mrs. Cadabby said to her two bodyguards, “This girl dislikes me and avoids greeting to me.

Could also be, "refuses to greet me."

Not only that, but she goes so far as to vomit towards me.

I cannot stand such an insult.

Can you throw this girl away into the river nearby river?

Throwing someone into a river already has the implication of "throwing away."

This might sound better as a command, rather than a request.
"Throw this girl into the river!"

I do not ever want to see her foreveragain.” The two men held Zoe in their arms and went out.

Alternatively, "I never want to see her again."

She caught sight of the two men's taking Zoe to somewhere.

The governor imposed high taxationes on the people in the city and collected money to enjoy big parties with the rich peoples everyday.

Those scars letmade Ernie presumethink that Zoe had been hit by someone.

Oof!” Zoe hid her mouseth with her hand.

Mrs. Cadabby kicked Zoe in her belly up with tip-toea high-heeled shoe.