Can I use her security deposit to cover these legal fees I've incurred due to her not moving out?

Blockchain on the other hand as a technology does have useful applications I am certainly no expert. 

Do nothing...the tenant isn't renting that area and has no right to dictate how you use it as long as it poses no security/safety risk to them. 

Section 8 tenants are another way to secure rent payment with government backing.The Midwest is a solid market for rent growth, cashflow, and decent appreciation.Look at a market like Lansing, MI.

While I'm not entirely discouraged, I feel like I've invested significant resources (LLC, website, domain) without securing a deal that generates cash flow.Any advice or guidance would be greatly appreciated. 

Balance Sheet can show how much was a building was purchases for, how much principal loan is still outstanding, how much is in escrow and how much is in tenant security liability, Construction typically in the long-term development are put in the balance sheet and not P&L.Most investors are doing multiple type of real estate, not just rental.

Remember, the notion of amassing wealth without investing is a dangerous myth perpetuated by self-proclaimed experts.

Cook , he's an expert on the mountain. 

Sometimes it’s the smartest move to gain liquidity and to secure your position with your remaining properties.

Beyond that, you need to become an expert on labor and material rates in your area or get connected with someone else that is.