She then told me she isn’t paying her rent because of that.

His wife asked me about bugs during the tour, and now she is telling me she is an extreme germaphobe...They thanked me for fixing their FIRST issue. 

She dropped the check off on time and I was relieved.She post dated a check without asking/telling me she was doing so, naturally I cashed the check since I figured she was out of her mess and now paying on time. 

To me,  she has no blame.  

She never told me she was moving, she just up and left.

Then she said if the place was empty during the inspection, which it was, to send a registered letter to the last known address (the rental since she never told me she was leaving or give an address) saying since the property was abandon we were taking possession and changing the locks that day, and if she had a problem with it to get a hold of us. 

Don't know if SC is different but a QCD in SC does not require the derivation section to show the previous owner and where their deed was recorded.I was recording a QCD 2 weeks ago and the Register of deed clerk told me she couldn't file this without the derivation section (that is required on a General warranty deed or a special warranty deed).I showed her that this was a QCD and she pretty much said "my bad" that I was correct and recorded it.I can give you a QCD to the Golden Gate Bridge with no burden of proof that I own any of it, but if I don't own any of it you got nothing.

. - The previous tenant brought up the dishwasher issue but told me she didn’t care one way or another if I replaced since she never uses it.

Those doors and drawers are easy for a DIY'er with low cost tools like a router and table saw.

The installation company becomes the utility, they own the equipment and lease it to you like your internet provider with the router.