Its a scare tactic and she is trying to bully you into letting her get away with this BS.You need to screen WAY better and/or hir e PM for future tenants. 

No one's perfect and honest mistakes happen and a PMC often needs guidance as to what level an owners wants to maintain their property.Wasn't trying to solicit your business,so I'll respond via DM about the rest of your questions:)

The property has a massive 900+ sq ft attic with very tall ceilings that would make a perfect 3rd unit potentially grossing another $1000 per month. 

STR management is 20-25% (I would recommend self managing or getting a VA), since income is higher you could probably get away with 5% for maintenance / cap ex but remember you need to cover utilities and cleaning for these units which drives up costs.

Share your thoughts and experiences on why Florida might be the perfect spot for your next investment property.

I figured this would be the perfect place to connect with like-minded people, get advice, and explore more resources to guide our decisions. 

If all you do is crunch numbers, it's easy to make anything not perfect.

I do see lots of self storage and warehouses going up, so my default assumption would be that the old shopping malls do NOT trade for less than build cost, but it's possible that the marketplace is not perfectly efficient. 

“Perfect BRRRRs” are rare nowadays.

Florida should be busy currently with people staying in the Winter to get away from the cold & snow.