Uber could fire you for any reason it wanted, or for no reason at all, just not for illegal reasons. Terminating your employment for a criminal...

Can I lose My job?

Maybe. If you have an employment contract, it would need to be reviewed. If you don't and are employed under the at-will doctrine your employer...

How does this situation sound?

She can try to work this out with the employer, but since she was likely employed under the at-will doctrine the employer was free to terminate her...

The employer is free to do what it wishes with the personnel file it maintains on you. It is their file, not yours. Hope this sheds some light.

In Florida, is it legal to work a salaried individual 16 hours per day for 28 days straight?

It's legal to work anyone as many hours that are desired that the employee is willing to work. The question is whether the compensation is proper....

Is there a limit to the amount of hours a person is to work when in a fixed salary position?

They can work you 200 hours a week for the salary if you let them. In order for you to be exempt from overtime pay you need to satisfy certain...

There is no legal definition. Typically full time is considered 40 hours a week; part-time anything less. Best of luck.

Is it legal for a Florida employer to withhold the final paycheck contingent on completion of an exit interview?

An employer cannot condition your earned pay on an exit interview. Contact an attorney of your choosing to reach out to them. Best of luck.

What options do I have if my employer does nothing about my being harrassed by two coworkers ?

The harassment and hostile work environment have to be based on legally protected characteristics. Nothing you mention here would seem to suggest...

There is no legal entitlement to severance pay unless you have a contract that requires one. Hope this sheds some light.