As someone who's been on the professional circuit for as long as Leylah has, and with her years of maturity and wisdom, she should have had handled herself much more gracefully during the MTO especially given that she would have to have known that a MTO was mandatory given Emma's condition...
Except, oh wait, this is a teenager playing at the highest levels of the game for the very first time in her life that we're talking about. She's allowed to be pressed that it takes three minutes for a trainer to put on a simple bandage and another two for Emma to sit there and recharge with a sports drink before break point in a very tense moment of the match while Leylah herself had to wait a bit before even being caught up with what was going on (it took two whole minutes before the umpire finally called the MTO oficially). And when she ends up losing the match in that very game where she had break point and some actual momentum, it's perfectly understandable that she would have a moment of sad, angry frustration. Anyone judging Leylah negatively for the ending of the match is weird.
Regarding the rest of the match, I'm happy for Emma and she played brilliant, lights out tennis. A bit disappointed with the final though since Leylah never really got to 100%. She never found her serve, she was a step slow to shots she hadn't been slow to in the past, and some tired groundstrokes produced truly awful-looking errors. The two big mysteries for me this match is if Leylah would have the energy to make this a proper fight, and if Emma could hold her nerve and handle any adversity if things turned especially dramatic. In the few dramatic moments there were Emma held steady, and Leylah unfortunately didn't seem to have the energy to apply enough pressure (hard to do when you're serving below 50% for most of the match).
Big props to Emma though, who can surely win many more titles if she can reproduce her level from this event.