Not Quite Non-Lexical Vocable
Iron Chef of Music — battle notes

https://ironchefofmusic.com/ingredients/not-quite-non-lexical-vocable

Two hours; one sample; no winners.

Technically, she is saying "bye", but non-lexical vocables, which may be mixed with meaningful text, are a form of nonsense syllable used in a wide variety of music. Common English examples would be "la la la", "na na na" or "da da da". 

This pack is meant to be remixed. Read the rules and upload your
own take at https://ironchefofmusic.com/ingredients/not-quite-non-lexical-vocable