Μια μαμά σπρώχνει το καρότσι της αργά στον πεζόδρομο.

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Breakdown of Μια μαμά σπρώχνει το καρότσι της αργά στον πεζόδρομο.

• η μαμά: the mom
• σε: on
• της: her

Questions & Answers about Μια μαμά σπρώχνει το καρότσι της αργά στον πεζόδρομο.

What does Μια mean here, and why is it Μια and not Η?

Μια is the feminine singular indefinite article: ένας / μία (μια) / ένα = a / an.

• Μια μαμά = a mom
• Η μαμά = the mom

So Μια μαμά σπρώχνει… means A mom is pushing…, not The mom is pushing….
The choice of μια vs η is simply indefinite vs definite, just like a vs the in English.

I sometimes see Μία with an accent and sometimes Μια. Is there a difference?

In modern usage:

• Μια and Μία can both function as the feminine “a/an”.
• Μία with an accent is often used when you want to stress “one (single) woman / mother” rather than just “a”.

In everyday writing, many people just use μια (no accent) for the article a/an.
So here, Μια μαμά is simply a mom, and you could also see it written as Μία μαμά without changing the meaning in normal speech.

Where is the word “she” in this sentence? Why isn’t it written?