Compared to other companies the experience is really bad .... 

Quote from @Samuel Coronado: Keeping it is a bad idea.

But at a $1.5M asking price, as long as you don't have to spend more than $300k in rehab (without raising rents), this is a slam dunk deal that should easily be financed  at 75% LTV by a "investment real estate-friendly" bank/credit union that is located fairly close to the properties.

I had belatedly realized that FHA goes off personal credit and therefore I couldn't use the LLC for it.

If the yard is bad but everything else is move-in ready, that’s one thing.

She uses QBO and is linked to my online banking and a couple of credit cards.

Using a smaller bank or credit union is the way to go.Being that you have been in business for 10 years I am VERY surprised your business banker can't help you!

Was the business credit enough to put towards a deal? 

Look back and evaluate good moves, bad moves.

In court, I produced text messages between myself and the tenant showing I was attempting to fix the issue, but since she said she was without heat for 3 months during the winter, it looked really bad.