The profit was used to buy a higher quality SFH in the same area.

I think a bit simplistic when it comes to business; solve problems 4-profit. 

Maybe that is gross profit when you sell it, but what about the cost to build it?  

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Since I renovated it to my preferences, the home was able to command $3,500 rent/month with roughly $1,100/month in profit. 

Now, if she had someone she implicitly trusts to manage it, as though she were present, that might work, but the added costs would probably make the endeavor non- profitable.  

There i a bit of research that needs to be completed early on in order to get a good judgement on the feasibility of this; from there, the "Official" way to ensure you could pursue this would be to request a "Zoning Opinion Letter" to receive an Official decision from the Department of Zoning in order to ensure this will not cause any issues during your permit review. 

Sounds like you found a profitable niche 

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It outlines profit and losses from rental real estate.