A lány soha nem késik a találkozóra.

Yes—a/az is the Hungarian definite article, usually corresponding to English the.

• A lány = the girl (a specific girl in context)
• a találkozóra = to the meeting (a specific meeting)
  The article stays a (or az) even when the noun takes a case ending like -ra/-re.

Hungarian commonly uses “multiple negation,” and it’s required in standard usage.

• soha = never
• nem = the basic negator (not)
  So soha nem késik literally looks like “never not late,” but it simply means never is late / is never late.

In neutral sentences, nem typically appears right before the verb (or before the focused element). Here the verb is késik, so:

• soha nem késik is the natural pattern.
  You can rearrange for emphasis, but the meaning/focus changes. The given order is the most straightforward.

késik is the verb to be late / to arrive late. Hungarian often expresses “be late” with a verb rather than “be + adjective.”

• (Ő) késik. = She/He is late.
  It’s an intransitive verb (it doesn’t take a direct object).

késik alone already means is late. You may also see:

• elkésik = to be late / to end up being late (often feels a bit more “event-like”)
  In many everyday contexts, késik and elkésik can both work, but késik is perfectly normal here.

-ra/-re is the “onto/to” directional case, often used for events and appointments in the sense of for/to:

• a találkozóra = to/for the meeting (i.e., for the time/place of the meeting)
  So the sentence means she isn’t late for the meeting.

Yes, but the meaning shifts:

• a találkozóra = for/to the meeting (being late for the appointment)
• a találkozón = at the meeting (location: she is not late while being at the meeting—usually not what you mean)
• a találkozóhoz = to the meeting (as a place/point), more like approaching a location; less idiomatic for “late for a meeting” than -ra.

Hungarian often drops subject pronouns because the verb ending and context make the subject clear.

• A lány … késik already identifies the subject as the girl, so ő would be unnecessary unless you want contrast/emphasis.

Hungarian word order is flexible, but it encodes emphasis (focus). The original is neutral:

• A lány soha nem késik a találkozóra.
  If you move soha later, it can sound more emphatic or stylistically marked, and may change what feels highlighted. The given order is the most natural for “never.”

Both can be possible depending on meaning:

• a találkozóra = to the meeting (a specific one)
• találkozóra can sound more general, like to a meeting / to meetings / for an appointment depending on context.
  In many real contexts, speakers prefer the definite article when a particular meeting is understood.

It depends on the next word’s first sound:

• a before a consonant sound: a lány, a találkozó
• az before a vowel sound: az alma
  So A lány… is correct because l is a consonant.

It’s a base noun plus a case ending:

• találkozó (meeting) + -ra (to/for) → találkozóra
  The extra length is normal agglutination: Hungarian stacks meaning with endings rather than separate prepositions.