البنت كانت بتجري في الحديقة ومعاها كرة.

In Egyptian Arabic, an ongoing action in the past is very often expressed with كان plus the present-tense form with بـ.

So:

• كانت = she was
• بتجري = she runs / she is running

Together, كانت بتجري means she was running.

This is a very common Egyptian pattern. In Modern Standard Arabic, you would more often see كانت تجري without بـ, but in Egyptian كانت بتجري is the normal colloquial way.

Because البنت is feminine singular.

The verb كان changes for gender:

• كان = he was
• كانت = she was

Since البنت means the girl, the sentence uses the feminine form كانت.

They each do a different job.

• بـ is the Egyptian present marker. It often gives a meaning like is running, runs, or does run, depending on context.
• تـ is the subject marker here, and with this verb form it matches she.

So بتجري means she runs / she is running.

Compare:

• بيجري = he runs / he is running
• بتجري = she runs / she is running

In Egyptian Arabic:

• ج is usually pronounced like a hard g as in go
• ق is often pronounced as a glottal stop, like the pause in uh-oh

So:

• بتجري sounds roughly like bitigri
• الحديقة in Egyptian pronunciation is often something like el-ḥadī’a

That means this sentence sounds approximately like:

el-bint kānit bitigri fil-ḥadī’a w maʿāha kora

معاها means with her.

It is made of:

• مع = with
• ها = her

So literally, ومعاها كرة means and with her was a ball.

In natural English, that usually comes out as:

• and she had a ball with her
• and she was carrying a ball
• and she had a ball

In Egyptian Arabic, معاه / معاها is very commonly used this way to show that someone has something with them.

Because Arabic often avoids repeating the subject when it is already clear.

Here, the sentence starts with البنت, and then the second part ومعاها كرة continues talking about that same girl. There is no need to add هي.

So Arabic naturally says:

• البنت كانت بتجري في الحديقة ومعاها كرة

rather than repeating she the way English often does.

You could add a separate pronoun in some contexts for emphasis, but the version in the sentence is the normal smooth one.

It is understandable and correct, but it sounds a bit more formal or Standard-Arabic-like than everyday Egyptian speech.

In casual Egyptian, many people would more naturally say:

• الجَنينة

So a very colloquial version of the sentence would be:

البنت كانت بتجري في الجنينة ومعاها كورة

The original sentence is still fine, but it mixes Egyptian grammar with a slightly more formal noun.

في is the basic word for in or inside.

So:

• في الحديقة = in the garden / in the park

This is the most straightforward and natural choice here. It simply tells you where the running was happening.

When spoken quickly, في الحديقة is often pronounced together as fil-ḥadī’a.

Yes—Egyptians commonly pronounce كرة as kora in speech.

The spelling كرة is closer to the standard written form, while كورة is a very common colloquial spelling that reflects Egyptian pronunciation more directly.

So:

• كرة = more standard-looking spelling
• كورة = more colloquial Egyptian spelling

In everyday Egyptian speech, both point to the same word here: ball.

It is a mix, but a very natural kind of mix.

The clearly Egyptian parts are:

• كانت بتجري
• معاها

The more formal or Standard-Arabic-leaning part is:

• الحديقة

And كرة is written in a more standard-looking way, while many Egyptians might write كورة informally.

A more fully colloquial Egyptian version would be:

البنت كانت بتجري في الجنينة ومعاها كورة

But the original sentence is still perfectly understandable and useful for learners.