"She must know"
does MUST mean "she needs to know" or "she definitely knows"
It can mean "she need to know", but it would usually sound a bit odd, I think, when you could say "she must be told". It usually means "she very probably knows". You need a full sentence to tell the difference, and sometimes even more context than that.
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It can mean "she need to know", but it would usually sound a bit odd, I think, when you could say "she must be told". It usually means "she very probably knows". You need a full sentence to tell the difference, and sometimes even more context than that.
More context is needed to determine the exact meaning. Moreover, words sometimes mean different things for different people. We may never know for sure! ??
CB