The umpire was right, but he shouldn’t have “discussed” it with the spoiled brat. He should have said that his decision was final.
The highly-privileged member of two government-certified victim groups deserves nothing.
On top of illegal coaching, racquet abuse, verbal assault on an official, she should have been called for a time violation, which would have meant default, the umpire showed restraint.. Her rant went on for at least fifteen minutes. She was losing and exhausted and her only hope was to delay play and physically regroup, change the momentum of Osaka and use the crowd to get behind her, which she does all the time.
These “umpires” need the power to eject an unruly player. Act like a jerk and you’re gone. Match is over and you lose.
Show her the "Red Card" as in soccer.