I use hellofin.app - it texts me when there's money coming in or out and I can label the transactions.

If her concerns are reasonable, then she's a valuable asset to the team, thinking critically and pointing out potential issues you may not have thought about so you'll have solutions ready if they arise. 

He killed someone's chicken and we may be fined and him labeled a dangerous dog.

If it lists the serial number, sometimes you can tell from that - Google, like, "Rheem water heater serial numbers" or "State water heater serial numbers" to see how to read the serial number.The water heater in my house, and the one at my rental, have a clear date on the label. 

It is not a deal killer, but certainly presents risk when the entire park could be out of a sewage solution if the septic has a problem.

We are also looking into going the Airbnb route for vacation destination spots around the country, but I can make that a separate post if need be.Does anyone in the community have good experience/suggestions for areas with companies looking for housing solutions?

That was my solution to a similar question and happy to talk you through the details if you are interested.  

You need to document the complaint, the issue, the solution and all the times she has refused access.

He is one of the sharpest lenders I know, and sounds like something he will have a solution for if you want to pick his brain.

What is a cost effective solution here?