Elfhelm knew she was there, sure as hell. About other people in the secret... the less that know the better (particularly because Eomer would have entered in a killing rage against whoever let her travel to the battlefield).
Probably the cloud of smoke that covered most of Gondor and the eastfold helped a little to hide her true identity.
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You have reached the end of the road, my beloved enemy. The bad thing is that I reached it first.
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