Cash for keys is definitely the way to go and it’s normally only 2x the rent to get the job done. 

Is that normal now? 

Should I do a raised foundation, engineered flood openings, or fill dirt and do a normal crawlspace.

Just trying to understand you, and answer your question w/o trying to type out more of a lecture than I normally do here on BP.Oh, I'd start with the municpality's website to look for their zoning ordnances. 

I spent (and continue to do so on a daily basis) every day from 2019 to 2021 waking up between 4-5am and hitting the gym.

@Jeffrey McKee did the property warrant cleaning beyond “normal wear and tear”?  

How does the BRRRR method sidestep that or is it normally a 6 month waiting period?

., and she would finance the down payment and the loan is paid by the house, is it normal to assume a 50/50 split of profits or what would be a fair share in this case.

Does that mean that if normally we would charge 2200 per month that would increase it to more like 2500?

Well, there is a lot to consider besides just the normal cash flow and ROI.