She offered to pay a full rent's payment upfront, along with the deposit, to compensate for her current unemployment.Are there negatives or major red flags that are associated with this that I should consider as I evaluate her application?

These fees include charges for appraisals, inspections, title insurance, legal fees, lender fees, and various additional fees.Here is a list of some of the fees you can expect to pay in addition to the money upfront when investing in real estate:Loan origination fee: This is the lender’s fee for processing the loan application.

If they pass they can view and submit an application.

Quote from @John Underwood: First thing to do is check with the city or county to make sure the ADU would be permitted to be a STR.The municipality has an application process but initial indication is that it's not overly restrictive in the area I'm looking at. 

All that said I think $30 is probably industry standard so I haven't had too many applicants complain.

I find that when I allow pets, I get more and higher quality applicants who earn more, have better credit, and have fewer background problems.

This family of three finds that they never hear back from the larger rental agencies even after paying for an application.

I always make it a point to be upfront with my clients about potential fees from some of the lenders I work with, like application fees, appraisal costs, and others.

@Annette Eck I’d send a complaint to the real estate board and the agent’s broker, especially if you have video proof that the agent is giving lockbox code to applicants, not present with them.

That local government is who submits as "sponsor" for proposed applications.