I don't know anything about wholesaling, so maybe Russell is correct.
You will have no cash flow with an FHA a loan and 3% down. Without 20% the cash flow wouldn't even be worth it. Trust me, I know. I'm in the process of refinancing my primary residence so we can turn it into another rental in a year. Even with a .75% better interest rate, 80% LTV and dropping PMI, it's still not going to be great for cash flow. The COCR is good, so that's why we're doing it.
In my location a $100,000 house would have a total payment around $725/month. Max rent would be $800, $825 at the most. That's $900/year cash flow. Water heater goes bad, there goes your years profit. That's just one of the MANY things that could go wrong and cost money to fix. If things don't get fixed they might not be able to rent it. If they can't rent it that's $725/month that just came out of their pocket. If they're already having a tough time making ends meet, that rental could eat their lunch in no time.
I'm not trying to be negative or discourage their dreams, just trying to be a realist and shoot them straight. If Madeline has experience in property management, maybe she should focus on that. Maybe look at forming her own property management company? She'll make plenty of contacts that might set her up for future investing and good deals. It would be a lot safer and require less money. I would think it could even be done out of her home to start with. It sounds like you would already have your first client(Dad), so that's a nice way to start out a new business.
Good luck!
Matt