Birthday could still rise once The Voice performances get out of the top 30 since they're blocking it right now but it doesn't look like it will be a huge smash anymore
If she performs at the VMAs I'm confident that whatever song she performs will go #1 (hopefully Walking on Air, I think it'd be perfect since the GP is craving EDM-house and disco throwbacks and its a perfect combination of the two genres). Unfortunately she'll be missing the AMAs because she'll be in tour in Australia, but than I think whatever song she performs at the Grammys has a pretty good change at going #1, which will probably be a ballad (I'm thinking either Ghost, It Takes Two, or BTGOG even though I'd KILL for her to perform Spiritual

)
LL could also go #1 next spring/summer but I doubt it. I think she'll have at least 1 more this era though.