I don't think that's representative of Maricopa County. Note that the uncounted votes -- besides any the Dems manage to create out of thin air -- are early voting ballots. Early voting was heavily Republican in Arizona (44% to 33% with the rest independents).
McSally should be OK.
The RINO Secretary of State who was in charge of the voting process was primaried out this cycle, after a lot of problems in a previous election. Perhaps her eye wan't entirely on the ball.
Ronna McDaniel said they have had lawyers on the ground in Florida and Arizona. The ruling in Arizona evens out what has been happening in the Dem districts. She feels this will help McSally.
Same as your assessment.