Μετά από λίγες μέρες ανάρρωσης, η φίλη μου δεν είναι πια τόσο κουρασμένη.

Μετά από means after.

In Modern Greek, μετά από is the normal everyday way to introduce a time expression like after a few days. So:

• μετά από λίγες μέρες = after a few days

You may sometimes hear μετά by itself in speech, but μετά από is a very standard and safe pattern to learn.

Because μέρες is a feminine plural noun, and the adjective has to agree with it.

• λίγες = few for feminine plural nouns
• μέρες = days

Also, after από, Greek uses the accusative case, and λίγες μέρες is the correct accusative plural form here.

There is no article because the phrase is indefinite: it means a few days, not the few days.

Yes. Μέρες is the very common everyday short form of ημέρες.

So these mean the same thing:

• λίγες μέρες
• λίγες ημέρες

The version with μέρες sounds more natural in ordinary conversation.

Ανάρρωσης is the genitive singular of ανάρρωση, which means recovery.

The phrase:

• λίγες μέρες ανάρρωσης

literally means something like a few days of recovery.

This genitive is used to describe what kind of days they were. In English, we often translate it more naturally as:

• after a few days of recovery
• after a few days of recuperation

Because Μετά από λίγες μέρες ανάρρωσης is an introductory time phrase, and Greek often separates that from the main clause with a comma.

So the sentence is structured like:

• After a few days of recovery, ...
• Μετά από λίγες μέρες ανάρρωσης, ...

This is very similar to English punctuation.

Greek normally uses the definite article with possessive expressions.

So:

• η φίλη μου = my friend
• literally: the friend of mine

That is the standard Greek pattern. The article is not extra emphasis here; it is just normal grammar.

Because Greek weak possessive forms like μου normally come after the noun.

So Greek says:

• η φίλη μου = my friend
• το σπίτι μου = my house

This is one of the big differences from English word order.
If you put a possessive idea before the noun, Greek usually uses a different structure for emphasis, such as δική μου.

Because δεν is the normal negation word for statements, and it goes directly before the finite verb.

So:

• είναι = she is
• δεν είναι = she is not

This is the regular pattern in Modern Greek.

Here πια means any more / any longer / anymore.

So:

• δεν είναι πια τόσο κουρασμένη = she is not so tired anymore

In negative sentences, πια often gives the idea that something used to be true before, but is no longer true now.

Τόσο means so / that much / to such a degree.

So:

• τόσο κουρασμένη = so tired / that tired

This makes the sentence softer and more relative:

• δεν είναι πια τόσο κουρασμένη = she isn't that tired anymore / she isn't as tired anymore

Without τόσο, the meaning becomes stronger:

• δεν είναι πια κουρασμένη = she isn't tired anymore

So τόσο suggests improvement in degree, not necessarily the complete disappearance of tiredness.

Because the adjective has to agree with η φίλη μου, which is feminine singular.

So:

• η φίλη μου = feminine singular
• κουρασμένη = feminine singular form of tired

Compare:

• η φίλη μου είναι κουρασμένη = my female friend is tired
• ο φίλος μου είναι κουρασμένος = my male friend is tired

Because the sentence is describing her current state.

• Μετά από λίγες μέρες ανάρρωσης sets the background: after a few days of recovery
• η φίλη μου δεν είναι πια τόσο κουρασμένη tells us how she is now

So the timeline is:

1. she spent a few days recovering
2. now she is less tired

That is why the present tense makes sense.

Yes, Greek word order is fairly flexible, although some versions sound more neutral than others.

The original:

• Η φίλη μου δεν είναι πια τόσο κουρασμένη.

is very natural and neutral.

You may also hear:

• Η φίλη μου δεν είναι τόσο κουρασμένη πια.

This means essentially the same thing.
Small word-order changes in Greek often affect emphasis more than basic meaning.

Yes, if the subject is already clear from context.

Greek often drops subjects when they are understood. So:

• Δεν είναι πια τόσο κουρασμένη.

could mean She isn't that tired anymore, if everyone already knows who she is.

In the full sentence, η φίλη μου is included to make the subject explicit.