I am purchasing a duplex for myself to live in one unit and my adult daughter to live in the other unit. 

The only experience I have so far is the purchase of my own house last year in November, which I share with my beautiful wife and six year old daughter.

I have almost been thinking of purchasing buy and holds in out of state markets but keep reverting back to the "there is a strategy for every market" mentality, but cannot obviously get one to work.  

The other adult is her 18 year old daughter which I have no problem with since that is her child.I served her with a notice to cease indicating all of her lease term violations. 

You have to put a value on your time and mental stress of whether your doing something right or wrong. 

My husband and I did something similar for our daughter when she went to college and we didn't want to pay for a dorm for 4 years. 

If you do this, it's a mental obstacle to realize-- you aren't losing any money, you're just moving it from A to B.      

She also stated that she was thinking about selling her home, but not for another 1.5 years when her daughter gets done with high school. 

As far as I know they had a son and daughter.

The vast majority of homeless have varying degrees of mental illness.