Its usually the tenants who live in the lowest tier housing that are most prone to play games and take advantage. 

She is only upset as she is trying to game the system and you may have ruined it for her with this place.

I'm thinking about investing into section 8  housing in STL and I'm new to this game.

You are ahead of the game. 

This gets you in the game with minimal upfront costs.Covering the Smaller Costs (Inspections, Appraisals, Earnest Money, etc.)Even when using other people’s money, you’ll need some cash for earnest money deposits, inspections, and carrying costs.

Here’s why lease options are a game-changer:🔹 Low Risk, High Leverage – Instead of buying a property outright, you lease it with the option to purchase later.

Quote from @Scott Hertzog: Hey everyone,I am coming into this game a little later in life.

But not all land is fair game.

Bottom line—Tampa or Lakeland if cash flow matters, Miami if you’re playing the long game, and Orlando’s somewhere in between.

From what I've learned in this business is that you're not only investing into a deal, but into the people of that deal.I believe that real estate is a game of strong connections, not expensive playbooks.