This would at least require additional building materials and may necessitate other soft costs associated with redesigning the building. 

Most other real estate investment avenues within this budget would likely necessitate active involvement and a significant time commitment.For instance, acquiring a property with $25,000 in total out-of-pocket cash would almost certainly lead to substantial ongoing maintenance and repair obligations, directly contradicting her goal of passive income.

People who make good $, care about there credit and just so happen to have some life situation necessitating a rental for a time, like divorce or relocation?

This will necessitate the production of a Private Placement Memorandum (PPM), Operating Agreement, and Subscription Agreement.  

Trouble selling my NJ house necessitated STR.

I disagree with some on the side of "wholesalers are unlicensed realtors", not because of legalities, but because a realtor's motivation is not typically, especially in a bull RE market, to price with the investor in mind, but to price as high as possible to necessitate a sale, thereby leaving many possible buyers priced out. 

This will necessitate the production of a Private Placement Memorandum (PPM), Operating Agreement, and Subscription Agreement.  

But in reality it will take more, because once you quit your day job you become responsible for your own health insurance costs (unless covered by someone else)... so probably add $1,000/month for that as well, not to mention things like paying yourself a salary (which the IRS requires) if you are running your rentals under a corporate structure - which then necessitates employment taxes, etc.  

There are several financing strategies you might consider, depending on the lender's risk tolerance and your available capital.One option is a DSCR loan, which could work well if you can show strong projected STR income, but rural properties often require a higher DSCR (1.25x or more) and may necessitate a larger down payment.

This will necessitate the production of a PrivatePlacement Memorandum (PPM), Operating Agreement, and Subscription Agreement.Current cost are $8,000 to $15,000 for legal fees, inclusive of Form D filing with SECand notification filing for the states the initial investors reside in.