Nasza kierowniczka mówi, że dobra atmosfera w pracy pomaga zespołowi.

Because nasza has to agree with kierowniczka in gender, number, and case.

• kierowniczka is feminine singular
• the subject of the sentence is in the nominative
• so the possessive adjective must also be feminine singular nominative: nasza

Compare:

• nasz kierownik = our male manager
• nasza kierowniczka = our female manager

So nasza is used because the noun it describes is feminine.

Kierowniczka is the feminine form of kierownik.

It usually means:

• female manager
• female supervisor
• sometimes female person in charge

So:

• kierownik = male manager / manager in the masculine form
• kierowniczka = female manager

In modern Polish, some job titles now have both masculine and feminine forms, and kierowniczka is a standard feminine form.

Because dobra is an adjective and it must agree with atmosfera.

• atmosfera is feminine singular nominative
• so the adjective must also be feminine singular nominative
• dobry changes to dobra

This is standard adjective agreement in Polish.

Examples:

• dobry zespół = a good team
• dobra atmosfera = a good atmosphere
• dobre miejsce = a good place

Że means that and introduces a subordinate clause.

So the sentence structure is:

• Nasza kierowniczka mówi = Our manager says
• że dobra atmosfera w pracy pomaga zespołowi = that a good atmosphere at work helps the team

In English, that is sometimes optional:

• Our manager says that a good atmosphere at work helps the team.
• Our manager says a good atmosphere at work helps the team.

In Polish, że is normally expressed in this kind of sentence.

Because the preposition w usually requires the locative case when it means in or at a place.

The base form is:

• praca = work

After w, it becomes:

• w pracy = at work / in work

So:

• nominative: praca
• locative: pracy

This is a very common pattern:

• w domu = at home
• w szkole = at school
• w pracy = at work

Because the verb pomagać takes the dative case, not the accusative.

So the person or thing receiving help appears in the dative:

• zespół = team, nominative
• zespołowi = to the team, dative

That is why Polish says:

• pomaga zespołowi = helps the team

Even though English uses a direct object here, Polish grammar treats it differently.

More examples:

• Pomagam mamie. = I help my mother.
• Pomagamy kolegom. = We help our colleagues.

Zespołowi is dative singular.

The dictionary form is:

• zespół = team

Its dative singular form is:

• zespołowi = to the team

It appears here because of the verb pomagać, which requires the dative.

This ending -owi is very common with masculine nouns in the dative singular:

• student → studentowi
• kierownik → kierownikowi
• zespół → zespołowi

Yes. Both are 3rd person singular present tense forms.

• mówi = says / is saying
• pomaga = helps / is helping

Why singular?

Because each verb matches a singular subject:

• Nasza kierowniczka mówi — the subject is kierowniczka
• dobra atmosfera ... pomaga — the subject is atmosfera

In Polish, present tense forms often cover both simple present and present continuous meanings, depending on context.

Because Polish has no articles like English a, an, and the.

So:

• dobra atmosfera can mean a good atmosphere or the good atmosphere, depending on context

In this sentence, English naturally uses a good atmosphere, but Polish simply says dobra atmosfera.

This is something English speakers often have to get used to: Polish does not mark definiteness with articles.

Yes, Polish word order is more flexible than English, because endings show grammatical roles.

The sentence as given is neutral and natural:

• Nasza kierowniczka mówi, że dobra atmosfera w pracy pomaga zespołowi.

But other orders are possible for emphasis, for example:

• Nasza kierowniczka mówi, że zespołowi pomaga dobra atmosfera w pracy.
• Dobra atmosfera w pracy, mówi nasza kierowniczka, pomaga zespołowi.

These versions shift emphasis or sound more marked. For learners, the original order is the safest and most natural.

Usually at work is the most natural translation in English here.

So:

• dobra atmosfera w pracy = a good atmosphere at work

Literally, w often means in, but idiomatic English usually prefers at work in this context.

So the Polish phrase is normal, and the best English equivalent is usually at work, not in work.

Że is pronounced roughly like zhe, where ż sounds like the s in measure or the g in genre.

A rough guide:

• że ≈ zhe

A few pronunciation notes:

• ż is a voiced sound, like zh
• e is like eh

So że is short and simple, but it is important because it is a very common word in Polish.

Yes, kierowniczka is a normal Polish word for a female manager or supervisor.

You may also hear menedżerka in some contexts, especially in business language, because it comes from menedżer = manager.

The difference is mostly about style and context:

• kierowniczka = female head/supervisor/manager; a very Polish-looking word
• menedżerka = female manager, often in corporate or business settings

In your sentence, kierowniczka sounds completely natural.