I have a bad property I want to get rid of and need to get the tenant out and am thinking cash for keys would be a faster and more cost effective than going through the eviction process.

Let caulk dry fully before draining water.You can do this with a shower pan also but use weights  or something really heavy  to  weigh it down.FYI caulk and grout caulk clean up with water and is more user friendly.

This was quite concerning to me and I was wondering if that held any weight?

In my state it is legal and if they don't do the work you can get them out faster than a normal tenant.

You'll probably get more rent, rent it faster, and to a better tenant using a realtor.   

It depends on what the OP meant by  “she doesn’t pay rent” does that mean she was never asked for rent or if she agreed, but doesn’t pay.Ejection is a option if she didn’t ever pay rent nor was required, but a demand for rent and eviction is a faster and less costly process.  

I mean it’s not a bad thing and it doesn’t mean be super cheap but it will end up costing you much more then any gesture could be worth and won’t add much value. 1000$ dishwashers are nice and may move a tenant in faster theoretically but fixing one can be stupid and people don’t use more then a few settings on it anyways!

@Lyn Zo  I've never thought about it that way, but I think you could make a case that the lower crime areas have appreciated faster than the high crime areas. 

I am leaning towards investing so that I can pay back my debt faster than I would otherwise and be able to increase my income. 

You will either have to hire and fire successive agents (shotgun approach) or you will have to study and evaluate an individual for some time to see if what others have told you is true (Sniper approach) sorry there isn't a faster way really outside of a lucky pick.