Küçük kız bana küs değil; sadece bugün sessiz.

In Turkish, present-tense sentences with nouns or adjectives often do not use an explicit verb like English is / are.

So:

• Küçük kız bana küs değil = The little girl is not upset with me
• Sadece bugün sessiz = She is just quiet today

The idea of is is understood automatically.

In the negative, Turkish uses değil:

• mutlu = happy
• mutlu değil = not happy

So küs değil means is not offended / is not sulking / is not upset.

Küs is a very common Turkish word, but it does not match one single English word perfectly.

It usually means something like:

• offended
• sulking
• not speaking to someone because of hurt feelings
• cross with someone

So bana küs değil is not just not angry at me. It often suggests:

• she is not holding a grudge
• she is not giving me the silent treatment
• she is not upset with me personally

It is a very natural word in everyday Turkish.

Because küs takes the person it is directed at in the dative case.

• ben = I
• bana = to me
• sen = you
• sana = to you

So:

• Bana küs. = She is upset with me.
• Sana küs. = She is upset with you.

This is something you often just have to learn with the word:

• birine küs olmak = to be offended with someone / to be sulking at someone

So the pattern is:

• X, Y’ye küs = X is upset with Y

This is one of the small irregularities learners notice early.

Normally, the dative ending is:

• -a / -e

But the pronouns ben and sen change a bit:

• ben → bana
• sen → sana

Not bene or sene in standard Turkish.

You simply need to memorize these two forms.

Turkish often leaves out subject pronouns when they are clear from context.

So instead of saying:

• O bugün sessiz. = She is quiet today.

Turkish can simply say:

• Bugün sessiz.

And in your sentence:

• Küçük kız bana küs değil; sadece bugün sessiz.

The subject küçük kız is already stated in the first clause, so there is no need to repeat o in the second clause.

This is very natural Turkish.

Yes. In Turkish, küçük means small / little, and kız means girl.

So:

• küçük kız = little girl

This is the normal way to say it. Turkish uses the adjective directly before the noun:

• küçük ev = small house
• güzel araba = beautiful car
• sessiz çocuk = quiet child

So the word order here is completely standard: adjective + noun

Not always. Kız can mean:

• girl
• daughter
• sometimes young woman, depending on context

In this sentence, küçük kız clearly means little girl, not daughter, unless the broader context says otherwise.

So context matters a lot with kız.

Değil is the standard Turkish word used to negate noun and adjective predicates.

For example:

• Hasta. = He/She is sick.

• Hasta değil. = He/She is not sick.

• Mutlu. = He/She is happy.
• Mutlu değil. = He/She is not happy.

So:

• küs değil = not upset / not offended

You do not make this negative by changing küs itself. You add değil after it.

Because Turkish often prefers a short, economical structure when the meaning is obvious.

The full idea is:

• Küçük kız bana küs değil; sadece bugün sessiz.
• The little girl isn’t upset with me; she’s just quiet today.

The second clause does not repeat what is unnecessary:

• no repeated o
• no repeated noun
• no explicit is

Turkish is very comfortable with this kind of omission when context is clear.

It emphasizes that the quietness is temporary and limited to today.

So the meaning is something like:

• She’s just quiet today
• It’s only today that she’s quiet
• She isn’t upset with me; she’s simply quiet today

This helps contrast with the first clause:

• not because she’s offended
• just because today she’s quiet

Yes, Turkish word order is flexible, but different orders can slightly change emphasis.

Your sentence:

• sadece bugün sessiz

This naturally emphasizes today as the limited situation.

Other possible orders might be:

• bugün sadece sessiz
• bugün sessiz sadece (less natural in normal speech)
• sessiz sadece bugün (very marked, poetic or emphatic)

The original version is very natural and idiomatic.

Not grammatically. It is mainly a punctuation choice to show a strong connection and contrast between the two clauses.

• Küçük kız bana küs değil; sadece bugün sessiz.

The semicolon helps the reader feel:

• first idea: she isn’t upset with me
• second idea: there’s another explanation—she’s just quiet today

A comma could also appear in some writing, and in speech the difference would mainly be in intonation, not grammar.

Yes, that is a very natural translation.

Possible English versions include:

• The little girl isn’t upset with me; she’s just quiet today.
• The little girl isn’t mad at me; she’s just quiet today.
• The little girl isn’t sulking at me; she’s just quiet today.

The best choice depends on context, but mad at me and upset with me are both good everyday translations.

You would simply remove değil:

• Küçük kız bana küs. = The little girl is upset with me.

And if you wanted the full contrast:

• Küçük kız bana küs; sessiz değil.
  = The little girl is upset with me; she isn’t just quiet.

So the key contrast is:

• küs = upset / offended
• küs değil = not upset / not offended