This is the 177th most frequent Czech word.
řekla
"Řekla" means "she said" in English.
Here, 'řekla' is the past tense form of the verb 'říct' (to say), in the third person singular feminine.
Řekla, že přijde později.
She said that she would come later.
Here, 'řekla' is used to indicate that she (feminine subject) expressed or revealed the truth in response to a question.
Když se jí zeptali, co se stalo, řekla pravdu.
When they asked her what happened, she told the truth.
In this sentence, 'řekla' again is the past tense feminine form of the verb 'říct', and it is used to indicate an action where someone communicated.