You have. By your own admission. You owed the braider for work done. She was unpaid for four weeks.
You could’ve paid her per your records on the agreed upon pay date. You didn’t. You withheld her pay. You routinely pay out without comparing, so saying comparing is required doesn’t track–again per your own words. You also routinely pay partial payouts on the agreed upon pay date and the rest later, which is also withholding pay.
Running payroll is hard. Lots of moving parts, lots of regulations. It’s clearly beyond your scope. Hire a payroll manager. Form actual business accounts. Venmo is clearly not the appropriate vehicle for this, especially since it appears to be your personal account.
Btw, releasing medical information about an employee opens a pretty ugly can of worms. Lots of laws around that. Don’t do that.