Someone very important said "grow where you are planted", might think long and hard about moving, you should think from your business standpoint and increase your target area, you have many advantages there you may not realize.

Remove it and plant some rocks.Frank

They chose to manage it themselves to save the $1,000-1,200/year cost of professional property management but they have lost considerably more than that and had to suffer many more headaches.There are some really savvy DIY landlords here, but if that's the way that anyone decides to go, they have to ensure that they are educated and proactive.

But then their Cash-on-Cash return will suffer.

From what it sounds like, she has not given you a second of consideration when it came to things you needed of her, so why should you suffer on both ends?

If you have a desire to jaz it up a little you can work on the fence and just keep plants, shrubs, and trees trimmed up correctly.  

Puerto Rico had suffer the major devastation in its last 100 yr history, with an already devastated infrastructure and huge debt (bonds and bonds for +two decades, NY hedge funding making $100/$1, allowed for decades without interference from US government). 

If it were my house, I'd make them disappear with fencing, planting, or a combination of the two. 

The garden is now half covered by weeds, many plants untrimmed, two plants dead due to lack of maintenance, and serious blackberry invasion on the backyard to make the original plants unhealthy...

I'm happy to say that year one was a year of planting seeds, and leaping over frogs (deals gone bad).