Titanic Sinclair talking to spectators & fans of Poppy & then an encore performance of Poppy performing Money at Meow Wolf in Santa Fe, New Mexico on Tuesday, February 13, 2018. Poppy is ICONIC!
She's singing. There's clearly some vocal massaging going on, background vocals as well, and you can hear in this video that the mic level is adjusted when she starts singing in her quieter, breathy voice (in other live performances it's hard to hear her sing those parts). The second to last time she sings "if money can't buy happiness then why is it so fabulous" she actually forgoes the breathy voice and just sings it like the rest of the lines, and you can hear her drop out as the word "fabulous" arrives because she starts singing the line "gimme some of that" which overlaps.