These things will enable you to be more decisive and help you lower your risk.  

Are you aware of the new ADU law that enables you to convert a garage or build a new free standing structure up to 800sqft with streamlined requirements?

Enabling behavior FEELS helpful, but it only allows her to continue in this path.

@Wayne Brooks Moving is better than enabling a corrupt and mindless landlord.

My question is is there any kind of database that is available to find local homes without mortgages?

As a busy mother, it is challenging to "drive for dollars" are there any databases that contains information on houses that are for sell, and interested investors? 

This way, you keep your assets but also have access to cash when needed, helping you stay afloat and cover any cashflow shortfalls while enabling you to take advantage of buying opportunities.One should remain mindful that when things get tough, some banks historically have chosen to shorten or outright close lines of credits if they perceive borrowers as high risk, even if the account has zero balance or is otherwise fully performing and current.

When it is time to buy I can go back to this database and see what houses rented for in the area and how long they were on the market.  

Driving for dollars is something I am looking at for my next purchase, building a database of properties I'd purchase and peppering them with marketing materials.

Maybe a local broker with access to Costar, Reonomy or some database would help, or if they personally track the info...they might be willing to help you out.