The winning bidder won't have documents to prove ownership, so how can they protect their money or interests during this time?

You should consult an attorney or CPA for your specific situation.ANONYMITY: When you create the LLC, your name is recorded on the documents and published on the Secretary of State's website for all to see.

I sent all my documentation in Feb.

What is the specific process/documentation we need to go through to remove her from the LLC (can I do it myself or do I need to involve an attorney)? 

I would suggest an AirDNA report and any other documentation you can get from property managers, other hosts, etc. that support the higher income figure. 

Go to the hearing with your lawyer (or just send the lawyer if you yourself can't make it) and bring all the documentation you have on the building, especially those inspections.

But, there are some things you can do:  First, review your associations Covenants or governing documents. 

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Lease and estoppel are two different documents.

How about IRA requirements, for instance to be a real estate professional you need to document x# of hours (which is nearly impossible to do w/a W2 job.)