But Akram was always disturbed and felt sad about losing his brother, Bikram.

You could use the word disturbed, or choose another one. Maybe depressed?

Later, he disappeared from the palace.

Maybe identify who “he” is.

Akram’s mother, Mayu, said, “The food is so delicious!”

Who made this?” ¶
Naeena said, “Mother, I made this.” ¶
But after taking dinnereveryone had finished eating the meal, all the family members started vomiting blood.

One more thing – I also killed your brother and wife.” ¶
King Akram, shocked, said, “What!?!”

aren't“Are you arefor real Naeena ?” ¶
¶
Naeena laughed evilly and said, “I am not Naeena.

Not sure if this was exactly what you meant.

“I am Layla!” ¶
¶
¶
After hearing the name, Akram became frightened and asked, “Who are you?”

A witch?

Have this in the same paragraph as the one above and below. And maybe have it as, “The witch who killed our priest …”

(See above comment) Who killed our priest and my grandfather?” ¶
¶
Layla said, “Yes, I am the one who killed your ancestors . For several years I waited, and today your family will vanish forever from the royal throne!” ¶
Just then, Akram stood up angrily and attacked Layla.

That’s why Layla couldn’t defend himerself properly.

Maybe write it more subtly. “Akram’s speed caught Layla off guard and she was hit in the face.”

So he hit her on the face.

See above comment.

The witch Layla got angry and ordered her pet jackal to attack Akram.

Because of that mistake, your royal family will be destroyed forever!” ¶
Suddenly, Layla became serioushadows/silent and disappeared in the environment like smoke.

I don’t think “serious” really works here.

Story of Ratnag pPart- 8

or
Story of Ratnag, Part 8
Story of Ratnag: Part 8

But Akram was always disturbed and felt sad about losing his brother, Bikram.

you could also combine this with the previous sentence with a comma instead of the period after "the witch"

One day, the witch Naeena's mother came to the palace and had a long conversation with her daughter, Naeena.

Since you have already told the reader that you're talking about Naeena's mother, the reader knows that Naeena is her daughter. You could also omit "the witch" because the previous sentence told the reader that Naeena is a witch.

Who made this?” ¶
Naeena said, “Mother, I made this.” ¶
But after takeating dinner, all the family members started vomiting blood.

"eating" is usually used with "dinner"

aren't you arthe real Naeena ?” ¶
Naeena¶
The woman laughed evilly and said, “I am not Naeena.

or "are you really Naeena?"

If the author and reader are saying that this character is not Naeena, then it changing the way the author writes about her can help communicate the identify shift.

I am Layla!” ¶
¶
¶
After hearing the name, Akram became frightened and asked, “Who are you?

Who killed our priest and my grandfather?” ¶
Layla said, “Yes, I am the one who killed your ancestors . For several years I waited, and today your family will vanish forever from the royal throne!” ¶
Just then, Akram stood up angrily and attacked Layla.

That’s why Layla couldn’t defend himerself properly.

"herself" is the typical female pronoun

Because of that mistake, your royal family will be destroyed forever!” ¶
Suddenly, Layla became serious and disappeared into the environment like smoke.

"became serious" is a bit confusing

She suddenly appeared behind Akram and with her magical knife, she cut off his head.

"reappeared" would help communicate that she vanished and then returned, but "appeared" works OK