Are you certain there's no new potential causes of moisture in the home?

you could always repaint the cabinets and upgrade only the doors (lots of custom builders on fb these days). same for appliances - can probably score some gently used ones for a lot cheaper. i wouldn't worry about counters, unless they are beat up/rotten/etc. 

Not sure if it our dirt, or the moisture in the soil, or maybe the jalapeños and hot sauce we eat.   

I also add a automatic bath fan in all bathrooms to get that moisture out.

If she can't find a job, and can't find funds for rent, you will have to (gently, if possible) suggest to her that she will have to move in with someone else, as you have payments to make and must have the rent on a regular basis.

I sent a "gentle reminder" email letting him know that I had not received the second payment.

Someplace that old needs a thorough inspection of the foundation,roof,electrical panel and wiring,plumbing,water heater,and HVAC.Especially in a harsh weather climate like Wisconsin or anywhere up north.You really wanna check for long term water damage to the foundation and base of the property caused by years of snow and ice, no moisture barrier installed,and poor drainage.The cost of repairing these items should be factored into your bid price.You didn't say what the after repair value of the property was,only that they were asking 135k.If the ARV is only around 135k after improvement costs then 100k and just cosmetic changes would be decent.However,if you find after a thorough inspection that the place needs far more work to get up to code and up to stuff,then you need to show the owner all the problems and negotiate the cost down to cover those repairs.

Duplex was completely remodeled but one of the walls started to have some "moisture patches"It is only a portion of 1 wall and only in the downstairs unit.

When we decided it was a time to upgrade, we bought gently used 2014 Toyota Tacoma.

There are multiple ways to handle moisture from exterior preventative systems to interior French drains.