Learn what "i don't know what she's capable of" means, when people say it, and how to use it naturally in English.

This means the speaker is uncertain and possibly worried about what the other person might do.
From The Escaping Mistress, Episode 23
The speaker says they do not know what someone else is capable of.
Use it when warning someone that another person may be dangerous, unpredictable, or hard to judge. It can sound serious and tense.
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