"I talked to her."

Translation: Της μίλησα.

[deryckchan]

Why can't we use είπα here?

[mizinamo]

Because λέω is to say something or to tell someone something — not to speak or talk (= μιλάω).

[KBarlas]

I'm confused as to why την μίλησα didn't work here? thanks :)

[mizinamo]

I'm confused as to why την μίλησα didn't work here?

Because you didn't "speak her" -- you "spoke TO her".

Indirect object, so you use the genitive της instead of accusative την.

[HastaLaVista83]

But in a different sentence it was something like "Το παιδί δε με μίλησε".
This is accusative case, so why in this case genitive is needed?

[G.Georgopoulos]

I don't remember having such a mistake around - it must be "...δε(ν) μου μίλησε".

[Maia_TheOne]

I saw:
Το παιδί δεν μου μίλησε. Genitive case.

[Lng52-._]

"Μίλησα να της" is incorrect?

[Dimitra956826]

Yes , it's incorrect. Talk to someone = μιλάω σε κάποιον. So, to is translated as σε, not να.

I talked to her - (Εγω) μίλησα σε αυτήν/ (Εγώ) της μίλησα. ^.^

[Maia_TheOne]

Oh. Thank you very much. My dictionary gave me: Μιλώ με κάποιον για κάτι. I was in doubt translating με as TO. Now, Μιλώ ΣΕ κάποιον για κάτι, no doubt. Thanks again.

[troll1995]

Μιλάω με κάποιον and Μιλάω σε κάποιον have the same difference as talk with someone and talk to someone in English.

[slava8]

would "μίλησα της" be correct?

[mizinamo]

would "μίλησα της" be correct?

No, it would not.

Short-form pronouns such as της come before the verb, not after it. (Except in commands.)