Now that I've got over that WIG (No MAM, let's break it down.

CLEARLY less is more when it comes to Tamar and singing.
When she sat on that chair and sung White Candle she did excellent.

When she sung Pieces and All the way home she tried to be overly emotive stage presence wise, that it made her vocals too shaky and then she hit the wrong type of runs and notes.

Love and war she was just to tired, so stamina vocally will improve the more she does more shows with more than a couple songs.

Tip for future is build the vocal stability by focussing on vocals first rather than moving so much and also stick to the phrasing structure of the songs until fully comfortable doing them live and then play around with notations once seasoned into performing regularly.

Tamar is a naturally gifted vocalist but just pushes a bit too hard live, which actually is hurting her overall delivery.
Simplify and shine Tay Tay

(Sideeye is for THAT TING pun she head over most things)