Shakespeare exposes her hypocrisy and true cowardice.
"hadhenotresembledmyfatherasheslept, Ihaddoneit" exposes her innercowardice and ingrained fear of patricide.
Lady Macbeth emasculates Macbeth by saying "Ishametowearaheartsowhite" to ridicule his cowardice.
Manipulative as she operates within a liminalgender, she takes advantage of alleged feminineweaknesses when it works for her yet brutallyrejects it if it represses her.
"Alittlewaterclearsusofthisdeed"
Litotes (under-exaggeration)
Euphemism, cannot fully recognise what they have committed
Laced with irony as Lady Macbeth shifts to a melodramatic state of insanity and begins speaking in hyperbole as the guilt takes over (Act 5).
Euphemism of "deed"
Lady Macbeth fails to face up to the reality of it, she must placate it into less heinous words in order to keep her, albeittemporary, composure.
Shakespeare may have been creating a subtle commentary on how arbitrary (illogical) gender roles were, as this was a typical theme in his work.