This is the 518th most frequent Polish word.
mogła
"Could" or "was able to" (feminine, past tense).
The word 'mogła' is used to express an action that someone (a female subject) was able to do in the past.
Ona mogła iść na spacer po parku.
She could go for a walk in the park.
Here, 'mogła' is used in a conditional past tense to suggest that she would have been able to complete the project under different circumstances.
Mogła skończyć projekt szybciej, gdyby miała więcej czasu.
She could have finished the project earlier if she had more time.
In this sentence, 'mogła' indicates the ability to perform a specific action (speaking French) in the past.