Your tenant does not dictate the terms of the lease or the rental rate - you do...  

In almost all cases when there is one road leading to four homes and there is no development or shared amenities, one owner can not dictate what happens on the road or put up a gate.

The market dictates that price, not you, and there's no reason to feel guilty for that.I would give her a 60-day notice and not feel a tinge of guilt.

One of the most important is knowing when to stand firm and not let a buyer dictate the terms of your deal—especially when you know you have a good one on your hands.

Supply and demand will dictate.

Depending on the strategy you end up going with will probably dictate what property manager makes the most sense as they all have their different niches they excel at.

I will agree with Juul  but not the other examples the banks did not create the mortgage mess as you state is was the secondary market that dictated what paper they would buy.. banks and mortgage brokers just worked with the play book they were given. 

Since I started in real estate investing, I've researched all the exit strategies and understand that the property often dictates which strategy to use.

I take it your lease does not dictate who handles this? 

The reason I say could is because your current income, tax situation, and real estate investments can dictate if buying real estate might benefit you.