The fact that Heart Attack is the last song performed isn't a good idea. She doesn't sound good. They should lower the key.
But this isn't Unbroken era anymore. Ending the set with GYHAB or HWGA or even Unbroken would be...awkward. Just like the beginning of GYHAB she struggled, but she will gradually improve the live performance. Relax
The fact that Heart Attack is the last song performed isn't a good idea. She doesn't sound good. They should lower the key.
It's not a key problem at all. It's more about breathing. Her second performance of it was much better. I think it'll sound good in a standalone performance where she isn't so out of breath.