She does and its also the language.
You can hear more added sounds and the cadence is more mellifluous.
Navajo only has 4 vowels and they get differently and a lot more
English has heavy German roots and can sound like official language of dental association.
Unlike romance languages, English is hard to sing as it is spoken - a reason singers mumble over some words.
People often misunderstand words in songs not realizing its often done on purpose