U ambulanti su rekli da je pacijentica mirna i da već imaju njezin karton.

No. Ambulanta usually means a clinic, doctor’s office, outpatient department, or medical practice.

So U ambulanti means at the clinic / in the clinic, not in the ambulance.

This is a very common false friend for English speakers.

Because the preposition u meaning in / at takes the locative case when it expresses location.

• ambulanta = nominative
• u ambulanti = locative

So:

• ambulanta = a clinic
• u ambulanti = in/at the clinic

Croatian often leaves out the subject when it is understood from the verb ending.

• su rekli = they said

Here it means something like the staff there said, they said at the clinic, or simply an unspecified they.

This is very natural in Croatian. You do not need to say oni su rekli unless you want to emphasize they.

Both are possible, but word order in Croatian is affected by clitics like su and je.

In this sentence:

• U ambulanti su rekli...

the short auxiliary su tends to come early in the clause, after the first phrase U ambulanti.

You could also hear:

• U ambulanti rekli su...

but U ambulanti su rekli... is the more standard and natural version here.

Here da introduces a subordinate clause, like English that.

• rekli da je... = said that...
• rekli da ... imaju... = said that ... they have...

So the structure is:

• main clause: U ambulanti su rekli
• subordinate clauses: da je pacijentica mirna and da već imaju njezin karton

Because there are two separate subordinate clauses joined by i:

• da je pacijentica mirna
• da već imaju njezin karton

In English, we often omit the second that:

• They said that the patient is calm and already have her file

But Croatian often repeats da, especially when the second clause has its own verb. It sounds clearer and more natural:

• ...da je pacijentica mirna i da već imaju njezin karton.

Because pacijentica is feminine singular, meaning female patient.

So both the verb and adjective match it:

• je = is (3rd person singular)
• mirna = calm in the feminine singular form

Compare:

• pacijent je miran = the male patient is calm
• pacijentica je mirna = the female patient is calm

Mirna means calm, quiet, or settled.

In a medical context, it usually suggests the patient is:

• not agitated
• stable in behavior
• cooperative or peaceful

It does not necessarily mean healthy or fine in every sense; it refers more specifically to her state or demeanor.

Već means already.

So:

• već imaju njezin karton = they already have her file/record

Its position is flexible, but in this sentence it naturally comes before the verb:

• već imaju

That is a very common placement in Croatian.

Because the subject is still understood from the verb form.

• imaju = they have

Just like su rekli, this refers to an unspecified plural group, most likely the clinic staff.

Croatian often does this:

• Rekli su... = They said...
• Imaju... = They have...

No separate pronoun is needed.

Njezin means her.

So:

• njezin karton = her file / her medical record

Yes, njen is also used in everyday Croatian and means the same thing. But njezin is often preferred in more careful or standard language.

A useful contrast:

• njezin / njen = her
• njegov = his

Because karton is the direct object of imaju:

• imaju karton = they have the file

For masculine inanimate nouns like karton, the accusative looks the same as the nominative.

So:

• nominative: karton
• accusative: karton

That is why the form does not change.

In general Croatian, karton can mean cardboard. But in medical contexts, karton often means a medical file, patient chart, or medical record.

So njezin karton here means:

• her chart
• her medical record
• her patient file

not literal cardboard.

Yes. A natural English rendering would be something like:

• At the clinic, they said the patient was calm and that they already had her file.
• The clinic said that the patient was calm and that they already had her medical record.

A word-for-word breakdown helps with grammar, but a natural translation may adjust things slightly.