Right, but again, it's the combination of stilted language and alliteration AND interior rhyming IN ONE LINE that makes me think "I'm bromidic and bright as a moon-happy night pouring light on the dew" sounds so obviously "written."
"Dither" doesn't strike me as high-flown language at all, and "protestations" only slightly.
One other point to consider in context - the other nurses are listening in, and Nellie knows it. The vocab could be part of a deliberate bit of showing off.
