بعد ما وصلت رسالة، امي اتصلت فيني.

Here بعد ما means after when it introduces a whole clause:

• بعد ما وصلت رسالة = after a message arrived

The ما here is not negation. It is just part of the expression بعد ما in colloquial Arabic. This is very common in Levantine.

So:

• ما in ما رحت = not
• ما in بعد ما وصلت رسالة = part of after

Because the subject is رسالة and رسالة is grammatically feminine singular.

So the verb agrees with it:

• وصلت رسالة = a message arrived

In the past tense, وصلت here is she/it arrived for a feminine singular subject.

That is why you see:

• وصل with masculine singular nouns
• وصلت with feminine singular nouns like رسالة

Literally, it means a message arrived.

That is because رسالة is the subject of the verb:

• وصلت رسالة = a message arrived

If you want to say I received a message, Levantine often says:

• وصلتني رسالة
• or إجتني رسالة

The -ني means to me / me, so:

• وصلتني رسالة = a message reached me = I got a message

So this sentence, as written, is more literally After a message arrived, my mother called me.

Because رسالة means a message, not the message.

• رسالة = a message
• الرسالة = the message

So:

• بعد ما وصلت رسالة = after a message arrived
• بعد ما وصلت الرسالة = after the message arrived

Arabic uses the definite article الـ much like English the.

For the same reason as وصلت: أمي refers to my mother, and that is feminine singular.

So:

• اتصلت أمي = my mother called

The verb is in the past tense, 3rd person feminine singular.

In Levantine, once the subject comes after the verb, this kind of agreement is completely normal:

• اتصلت أمي
• إجت أختي
• راحت المعلمة

In this sentence, فيني means me after the verb اتصل.

So:

• اتصلت فيني = she called me

This is a dialect feature. In Levantine, some verbs take a preposition before the pronoun, and اتصل is commonly used this way.

So you get:

• فيني = in me literally, but here idiomatically me
• اتصل فيني = called me

Depending on the region, you may also hear:

• اتصلت عليّ
• اتصلت فيّ
• sometimes forms closer to MSA like اتصلت بي

So the important thing is: with اتصل, Levantine usually does not attach the object directly the way English does.

They are closely related.

• فيّ is a shorter form meaning in me
• فيني is a very common Levantine form with the same basic meaning

In many everyday Levantine sentences, فيني sounds very natural with verbs and expressions:

• اتصل فيني = call me
• فيني أساعدك in some dialect usage = I can help you or literally something like it is in me to help you

In this sentence, just learn اتصل فيني as a common expression meaning to call someone.

It is usually pronounced something like emmi or immi, depending on the speaker and region.

In casual writing, people often simplify spelling:

• امي instead of
• أمي or إمي

They also often leave out diacritics and other spelling details in everyday typing.

So امي here is just informal spelling for my mother.

It is clearly colloquial, especially Levantine.

The most Levantine-feeling parts are:

• بعد ما as a spoken connector
• فيني after اتصلت
• the overall conversational phrasing

A more MSA-like version would be something like:

• بعدما وصلت رسالة، اتصلت بي أمي

or, if you mean I received a message:

• بعدما وصلتني رسالة، اتصلت بي أمي

So the sentence you were given sounds like normal spoken Arabic, not formal written Arabic.

Yes. Arabic word order is fairly flexible.

The original sentence starts with the time clause:

• بعد ما وصلت رسالة، أمي اتصلت فيني

That structure emphasizes the sequence of events.

You could also say:

• أمي اتصلت فيني بعد ما وصلت رسالة

This is also natural and means the same thing.

Starting with بعد ما... is common when you want to set the scene first, like English:

• After a message arrived, my mother called me

Yes, in writing it can look ambiguous, because the same spelling وصلت can represent different meanings depending on context.

It can be:

• I arrived
• she/it arrived with a feminine subject

Here the next word tells you how to read it:

• وصلت رسالة

Since رسالة comes right after it, the natural reading is:

• a message arrived

So context resolves the ambiguity.

They could say it, but many speakers might more naturally say one of these if the meaning is After I got a message, my mother called me:

• بعد ما وصلتني رسالة، أمي اتصلت فيني
• بعد ما إجتني رسالة، أمي اتصلت فيني

If the intended meaning is really After a message arrived, then the original sentence works.

So the most natural version depends on what exact meaning you want:

• وصلت رسالة = a message arrived
• وصلتني رسالة / إجتني رسالة = I got a message