معدلها عالي، مع انها كانت غايبة كم يوم بسبب المرض.

معدلها is made of:

• معدل = average, rate, or in school contexts grade average / GPA
• -ها = her

So معدلها means her average or her GPA.

In this sentence, the school meaning is the most likely one.

In Arabic, the verb to be is usually not said in the present tense.

So:

• معدلها عالي literally looks like her average high
• but it means her average is high

This is completely normal in both colloquial Arabic and Standard Arabic.

If you want the past, then Arabic does use كان:

• كان عالي = it was high

That is why later in the sentence you do see كانت, because that part is in the past: she was absent.

Because عالي describes معدل.

• معدل is a masculine noun
• so the adjective must also be masculine: عالي

It does not agree with the person being talked about. Even though the sentence is about a female student, the adjective matches معدل, not she.

So:

• معدل عالي = a high average
• علامة عالية = a high grade

Notice how the adjective changes depending on the noun.

Yes, مع usually means with, but in this expression مع إنها means although / even though.

So:

• مع إنها كانت غايبة... = even though she was absent...

This is a common Levantine way to connect two ideas that seem to contrast.

You can think of it as a fixed expression here, not a literal with.

Because the speaker is talking about a past state.

• غايبة by itself = absent / she is absent depending context
• كانت غايبة = she was absent

This is a very common Arabic pattern:

• كان / كانت
  • adjective or participle

It often works like was / were in English.

So كانت غايبة literally means she was absent.

غايبة is feminine because it refers to a female person.

The masculine form is:

• غايب = absent, male

The feminine form is:

• غايبة = absent, female

Since the sentence is about her, the feminine form is used.

Arabic often leaves out subject pronouns when they are already clear.

In كانت, the ending already tells you the subject is:

• third person
• singular
• feminine

So كانت غايبة already means she was absent.

You could add هي for emphasis, but you usually do not need to.

Here كم يوم means a few days or several days, not a real question.

In context:

• كانت غايبة كم يوم = she was absent for a few days

In Levantine speech, many people also say كام يوم with the same meaning.

So depending on spelling or region, you may see:

• كم يوم
• كام يوم

Both can mean a few days in colloquial usage.

بسبب means because of.

So:

• بسبب المرض = because of the illness / because of sickness

Why المرض?

Arabic often uses the definite form in places where English might simply say illness or being sick. In this sentence, المرض sounds natural and means the illness/sickness that caused her absence.

So the whole phrase means:

• because of illness
• because she was sick

It is very easy to understand, and parts of it are close to both colloquial and Standard Arabic, but overall it feels more natural as spoken Levantine / colloquial Arabic.

Colloquial-feeling parts include:

• عالي in everyday speech
• كم يوم meaning a few days
• the general conversational phrasing

A more formal Standard Arabic version might be something like:

• معدّلها مرتفع، رغم أنها كانت غائبة بضعة أيام بسبب المرض.

So the given sentence is great for everyday Levantine-style speech.

A rough pronunciation would be:

maʕaddal-ha ʕaali, maʕ enna-ha kaanet ghaaybe kam yoom bisebab il-maraḍ

A few notes:

• ع in معدل and عالي is the Arabic sound ʕ, which English does not have
• غ in غايبة is like a voiced throaty sound, often written gh
• ال may sound like il- or el- depending on region

So you may also hear slightly different regional pronunciations, but the structure stays the same.