She is not releasing a single to coincide with Younger.
But yes, I feel like she should attend as previously outlined in my promo plan. It makes sense for her to do the little LA promo she can do for Younger the week before it premieres and then hit up all the NY promo slots on Monday/Tuesday.
I think the only problem is that the iHeartRadio Music Awards are on a Sunday. If there is any excuse H could use and get away with for not attending the show, it's that.