The pair fell out after Rod said that Elton’s farewell tour “stunk of selling tickets”.
The Rocket Man reflected on his recovery journey this week, saying he'd be dead if he hadn't reached out for help years ago.
The singer appeared during the "One World: Together At Home" concert, which celebrated essential workers during the coronavirus pandemic.
The teen Grammy winner and her brother Finneas O'Connell thrilled fans without show-business flourish in the iHeart Living Room Concert for America.
Alicia Keys, Billie Eilish, Mariah Carey, the Backstreet Boys, Tim McGraw and Billie Joe Armstrong are scheduled to take part in the event airing Sunday on Fox TV.
The star was forced to cut a show short in New Zealand mid-performance, due to "walking pneumonia".
"This is my bit towards it, and I love Australia so much.”
The singer demanded the fan was "immediately" returned to her seat.
The Rocketman singer had previously suggested the late Wham! star was "uncomfortable" with being gay.
The "Rocket Man" singer told British GQ he wished he'd "been invited to the party more" when it came to Disney's photorealistic remake of the 1994 classic.