I think it's one of these:

I Can't Help Myself (Sugar Pie, HONEY Bunch)
ABC
Dancing In The Street

MC Lyte & Missy Elliot - 'Cold Rock A Party' samples heavily Upside Down by Diana Ross.
https://www.youtube.com/watch?v=RQBwMxzXQ3A

Marvin Gaye's "What's Going On" because I really want to know what the **** is going on with this show.

Do You Love Me?

Like this...

https://www.youtube.com/watch?v=sdI-3-0ZNIA

Whatever she is going to being trying to sing or rap I will have the mute button ready.

THIS 😅☺😊

'Slay' as in 'murder'?

'Wannabe' by the Spice Girls rapping Mel B's part infused with a Motown-styled beat and prompting a standing ovation with Louis proclaiming "You're like a little Iggy Azelia"

Surely it is ABC like the OP suggested. Easy as Hun E G

Nope, you silly!! 'Slay' as in what Beyoncé did in the Grammy's 6 years ago!
https://www.youtube.com/watch?v=UqzKEMqKwf0

Honey G wasn't really good in the 6 Chair Challenge or the Judges' Houses, but she came back really STRONG last week and she absolutely NAILED her performance!

Three Times A Honey G by The Commodores.

I Can't Help Myself by the Four Tops ('Sugar pie, Honey G ...').

she'll murder whatever song she gets

Of course she did

ABC seems likely, since it has very few notes.

The thought of honey doing Motown is scary. I have my ears covered already.