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No it shouldn't harm her, so not a bad idea to treat for it if the cause of lethargy is unknown.

Generally the indicators of FTT is the size and lack of development (as there's something internally wrong which is stunting growth). I have zero experience with Silkies, unfortunately.

Her stance is definitely indicative of a bird that is unwell. Could be failure to thrive, could be coccidiosis (though if she's been like this for a while, I think that's less likely as it probably would've killed her already).