Please help me find the cover of a song "All of me" by John Legend

Hello everyone! I desperately need to find a song my girlfriend showed me once, but from certain reasons i am unable to just simply ask her about it.

I can play it perfectly in my mind so i just searched the lyrics hoping it will be enough, but what I found was the song "All of me" by John Legend. The lyrics match 1:1, but the song itself is completely different.

The one I'm looking for was sang by a woman. It began with, what seems to me, cheerful sounding piano notes. The overall vibe of the song was very old-school like but energetic (a bit jazz-like) , with vintage sounding instruments and the vocals sounding like from an opera with high notes etc.
She is into musicals, so that may be a clue.

I've listened to every cover with that title I could find, but found no match.
I'm begging for help.