Our current mortgage terms include a late fee after 5 days, so they’re already paying extra each month and have to split the total monthly payment up between 2-3 payments when they get their pay check.

I would look FAR AND WIDE for someone to do an investment property HELOC -OR- go to a bunch of banks and CUs (including who you bank with now) to find someone to provide an unsecured (or secured if you have other collateral) LOC to get rid of the high int debt.

Invested 3 years ago like others about $40,000 total which  included covering operational cost  for the first or so.  

Including one with a "great" rep on here. 

For example, what is the monthly revenue for the property and what are the "All In" expenses, including mortgage, taxes, insurance, utilities, repairs, etc...

Just to make sure we’re both on the same page, I’m referring to the annualized total return that is included in the bigger pockets rental calculator — I wasn’t intending to compare RE to stocks, but maybe I’m missing something in your answer.  

Properties like the Michigan complex offer a unique entry point, combining cash flow and significant upside potential.Immediate Cash FlowThis particular property is projected to deliver 6% annual cash flow from day one, already exceeding the yield of Treasuries.Value-Add RenovationsThe property includes hundreds of units that can be upgraded to Class A finishes, justifying rent increases.

The risk of "piercing the veil" applies more to LLCs when personal and business finances are not properly separated, not necessarily to individual landlords renting a portion of their home.A more practical approach is ensuring you have a solid lease agreement, sufficient liability insurance (including an umbrella policy), and properly reporting rental income and deductions on your tax return (Schedule E).

@Jonathan Klemm thank you for including me! 

Run a credit check, which will include her address history and the dates she lived at each one.