You need a cabinet that is wider than the sink.Check out the Kohler Whitehaven tall apron sink. 1) a 36" sink fits a 36" cabinet. 2) It is sel;f rimming which mean you do not need to be a master carpenter to nicely cut the sink into the cabinet. http://www.us.kohler.com/us/Whitehaven-Kitchen-Sin...You would have to be very careful with your measuring but this reclaimed 3" could allow you to put a standard 24" dishwasher to the left of the sink.  18" are the same or more expensive as a 24". 

She claimed health reasons, and I gave her every opportunity to work it out with me, but she never did and mostly ignored me when I reached out.

It's a touchy issue because it is a health hazard, abatement is expensive, and "professional tenants" really mar a genuine issue.

Full disclosure, I have a background in mental health and addiction treatment so I may be in the minority here.

“Its for ventilation, for good health!”

No response.The 15th comes and the husband says he has it but he gave it to the city because I didn't do anything about the mouse problem and he has called the health department and will be calling the news.

Finances aside, the cost to your health and safety if you don't do so legally is simply not worth it.  2.

Best to cover all your basis, this may be a health concern. 

In Beyond Pricing have what they call a health score that helps you to gauge the performance of your unit.

If it's taking time, or if there are/were potential health risks involved, the tenant has a point.