Selv om min søster er punktlig og nøjagtig, siger hun, at en god påmindelse giver hende mere ro.

Selv om means although or even though. It introduces a subordinate clause that sets up a contrast.

So the pattern is:

Selv om X, Y

= Although X, Y

In this sentence, the contrast is:

• she is punctual and accurate
• but she still says a reminder helps her feel calmer

This is because Danish main clauses follow the V2 rule: the finite verb normally comes in the second position.

Here, the whole opening clause Selv om min søster er punktlig og nøjagtig counts as the first element of the sentence. That means the verb of the main clause must come next:

• Selv om ... , siger hun ...

So:

• siger = second position
• hun = comes after the verb

If the sentence started directly with the main clause, you would say:

• Hun siger, at ...

At introduces a content clause, like English that.

So:

• hun siger, at ...
• she says that ...

In English, that is often omitted:

• She says a good reminder gives her more peace of mind

In Danish, at is very commonly kept.

They are predicative adjectives, meaning they come after er and describe the subject.

Because the subject is min søster, which is singular and common gender, the adjectives appear in their basic form:

• punktlig
• nøjagtig

Compare:

• min søster er punktlig
• barnet er punktligt
• mine søstre er punktlige

So the form changes depending on what is being described.

They are similar, but not identical:

• punktlig = punctual, on time
• nøjagtig = accurate, precise, exact, careful with details

Together they describe someone who is both reliable with time and careful/precise in general.

Because påmindelse is a common-gender noun in Danish, so it takes:

• en påmindelse
• en god påmindelse

If it were a neuter noun, you would use:

• et
• and often the adjective form in -t

For example:

• et godt råd = a good piece of advice

So here:

• en matches påmindelse
• god matches the common-gender singular noun

Hende means her, and here it functions as the indirect object.

The structure is:

• en god påmindelse = subject
• giver = verb
• hende = indirect object
• mere ro = what it gives her

So literally:

• a good reminder gives her more calm/peace of mind

Mere means more. It is the comparative form used here to show an increase.

Ro is an abstract noun meaning calm, peace, or peace of mind. Abstract nouns like this often appear without an article in Danish.

So:

• mere ro = more calm
• more peace of mind
• greater peace

You would not normally say en ro in this kind of sentence.

Because the sentence has more than one clause, and each clause needs its own subject.

In the first clause:

• min søster is the subject of er

In the main clause:

• hun is the subject of siger

Even though hun refers to min søster, Danish still needs that explicit subject in the new clause.

The first comma comes after the opening subordinate clause:

• Selv om min søster er punktlig og nøjagtig, siger hun ...

That comma is normal because the opening clause ends there.

The second comma appears before the at-clause:

• siger hun, at ...

In Danish, comma usage around subordinate clauses can vary a little depending on the comma system being used, so learners may sometimes see this written with or without that second comma. But the version you were given is completely normal.

Yes, learners will often see selvom written as one word in Danish.

In this sentence, it has the meaning although / even though either way. So if you later see:

• Selvom min søster er punktlig og nøjagtig ...

it means the same thing.

Yes. After at, you are inside a subordinate clause.

Here the order is:

• en god påmindelse = subject
• giver = verb
• hende = object
• mere ro = complement/object-like phrase

That is a normal Danish subordinate-clause pattern.

A useful extra point: if you add a sentence adverb such as ikke, it normally comes before the verb in a subordinate clause:

• ... at en god påmindelse ikke giver hende mere ro

That is different from a main clause, where Danish word order behaves differently because of the V2 rule.