لما شافت صاحبتها، البنت ضحكت وبقت مبسوطة.

Here لما means when.

So لما شافت صاحبتها = when she saw her friend.

A useful note: in Arabic, لما can have different uses in different contexts, but in this sentence it is a time word introducing a past event.

Because شافت is the past tense, 3rd person feminine singular form of شاف (to see) in Egyptian Arabic.

• شاف = he saw
• شافت = she saw

The -ت ending is what tells you the subject is she.

Since البنت (the girl) is feminine singular, the verb matches it.

صاحبتها breaks down like this:

• صاحبة = female friend
• ها = her

So صاحبتها literally means her female friend.

This is different from:

• صاحبها = her male friend / her boyfriend, depending on context
• صاحبتها = her female friend

In this sentence, it most naturally means her friend referring to a female friend.

No, they are different.

In شافت

The -ت is part of the verb and marks she in the past tense.
The final sound is not a pronoun meaning her.

In صاحبتها

The ها really is a pronoun, meaning her.

So:

• شافت = she saw
• صاحبتها = her friend

This is a very common thing in Arabic: similar-looking endings can do different jobs.

Because Arabic often allows the subject to be understood from the verb, but the speaker can still mention the noun for clarity or emphasis.

So in:

لما شافت صاحبتها، البنت ضحكت وبقت مبسوطة

the subject of شافت is understood as she, and then البنت is added in the next part to make it explicit: the girl laughed...

In natural English, we might simply say:

• When the girl saw her friend, she laughed...

In Arabic, this structure is also natural.

Because the subject is البنت (the girl), which is feminine singular.

So the verbs must agree with it:

• ضحكت = she laughed
• بقت = she became / she ended up
• مبسوطة = happy (feminine form)

If the subject were masculine, you would get forms like:

• ضحك = he laughed
• بقى = he became
• مبسوط = happy (masculine)

Here بقت means something like became, ended up, or got.

So:

• بقت مبسوطة = she became happy / she got happy

It is from بقى, which is a very common Egyptian verb. Depending on context, بقى can mean things like:

• became
• remained
• sometimes it has other conversational uses too

In this sentence, became is the best fit.

Because مبسوطة is the feminine form of the adjective.

• مبسوط = happy (masculine)
• مبسوطة = happy (feminine)

Since the sentence is about البنت (the girl), the feminine form is required.

مبسوط / مبسوطة is very common in Egyptian Arabic and everyday speech.

In Modern Standard Arabic, a learner might more often meet words like:

• سعيد / سعيدة = happy
• فرِح / فرِحة = glad, joyful

But in Egyptian Arabic, مبسوط / مبسوطة is extremely common and natural.

The و simply means and.

So:

• ضحكت وبقت مبسوطة = she laughed and became happy

In Arabic, و is attached directly to the next word, so it is written as one unit:

• و + بقت = وبقت

This is very normal in Arabic writing.

Sometimes learners wonder about that because English uses girlfriend in more than one way.

In Egyptian Arabic, صاحبتها most commonly means her female friend.
It does not automatically imply a romantic meaning.

Context is what would decide that, but in a sentence like this, the natural reading is simply her friend.

Yes, this word order is natural.

The sentence starts with the time clause:

• لما شافت صاحبتها = when she saw her friend

Then it gives the main action:

• البنت ضحكت وبقت مبسوطة = the girl laughed and became happy

You could also say something like:

• البنت لما شافت صاحبتها ضحكت وبقت مبسوطة

That is also understandable. But the original version is very natural because it highlights the when-clause first.

A simple pronunciation guide would be:

lamma shāfet sāḥbetha, il-bint ḍeḥket we baʔet mabsūṭa

A few helpful notes:

• لما = lamma
• شافت = shaafet
• صاحبتها is often pronounced something like saaḥbetha
• البنت = il-bint
• ضحكت sounds roughly like ḍeḥket
• بقت is often pronounced baʔet in Egyptian speech
• مبسوطة = mabsuuta

Pronunciation varies a bit by speaker, but this is a good general guide.