Hon säger lugnt till när någon går över hennes gräns, men hon gör det med omtanke.

Säga till is a fixed expression. Word-for-word it looks like say to, but in this sentence it means something more like:

• speak up
• tell someone
• let someone know
• say something firmly

In some contexts, säga till can sound quite strong, like tell someone off. But here, because of lugnt and med omtanke, it means she addresses the situation calmly and clearly rather than aggressively.

Because lugnt is functioning as an adverb here, meaning calmly.

In Swedish, many adverbs are formed with the -t form of the adjective:

• lugn = calm
• lugnt = calmly / in a calm way

So:

• en lugn person = a calm person
• hon säger lugnt till = she speaks up calmly

This is very common in Swedish.

Because säga till is a particle verb, and in Swedish particle verbs are often split in a sentence.

The basic form is:

• säga till

But in a main clause, other words can come between the verb and the particle:

• Hon säger lugnt till

That is normal Swedish word order.

You can compare:

• Hon måste säga till
• Hon säger alltid till
• Hon sa direkt till

So even though säga till belongs together as a dictionary form, it often appears split in real sentences.

The person is understood from context.

In this sentence, the idea is that when someone crosses her boundary, she says something to that person. Swedish often leaves the object unstated when it is obvious or not important.

So Hon säger lugnt till när någon går över hennes gräns focuses on her reaction, not on naming the exact person she is talking to.

English does something similar sometimes too, especially with phrases like she speaks up.

This is a very important Swedish grammar point.

Sin/sitt/sina refers back to the subject of its own clause.

In the clause:

• när någon går över hennes gräns

the subject is någon.

So if you said sin gräns, it would refer back to någon, meaning:

• when someone crosses their own boundary

But that is not the meaning here. The boundary belongs to hon, so Swedish uses:

• hennes gräns

This is exactly why hennes is correct.

Literally, går över means goes over and gräns means boundary or limit.

Here it is used metaphorically:

• gå över någons gräns = cross someone’s boundary / go beyond someone’s limit

So the sentence is about personal limits, not a physical border.

This is a natural way to talk about emotional, social, or personal boundaries in Swedish.

Yes, both singular and plural can work, but they feel slightly different.

• hennes gräns suggests a personal line or limit in a general sense
• hennes gränser emphasizes her boundaries as a set of limits

So:

• går över hennes gräns = crosses her boundary
• går över hennes gränser = crosses her boundaries

The singular in your sentence is perfectly natural.

Det refers back to the whole action already mentioned.

So hon gör det means:

• she does that
• she does so

In other words, det stands for her calmly speaking up when someone crosses her boundary.

Swedish uses det this way very often to avoid repeating the whole verb phrase.

Med omtanke means with care, with consideration, or thoughtfully.

• omtanke = consideration, thoughtfulness, care

So the sentence means that even when she sets a boundary, she does it in a considerate way. She is not cold or cruel; she is careful about how she expresses herself.

Because Swedish main clauses usually follow the verb-second pattern.

In this sentence:

• Hon = subject
• säger = finite verb

The finite verb comes in the second position:

• Hon säger ...

Then you get the adverb and particle:

• Hon säger lugnt till ...

After that comes the när clause:

• när någon går över hennes gräns

That subordinate clause has its own structure.

A useful comparison is:

• När någon går över hennes gräns, säger hon lugnt till.

Here the sentence starts with the när clause, so the main clause changes to säger hon because Swedish still keeps the finite verb in second position in the main clause.

Men means but and connects two contrasting ideas:

• she speaks up when someone crosses her boundary
• but she does it with care

So the contrast is not between speaking up and staying silent. The contrast is between being firm and still being considerate.

That is why men fits well here.