If she's lived there just one year and the lease has no language that it will renew/turn into a month to month rental agreement after the initial term/ETC. you are fine with a 30 day notice.

After learning more it might be favorable for me to sell my unit since it is my primary residence and I have lived longer than two years. 

I live at Azure Residences overlooking the Caribbean Ocean in Aruba.

We'd come back and fix it back up again and then eventually sell it as it will not be our forever home.The question is... if we move back into it, how long will we need to live in it to re-qualify for the tax exclusion?

It's an owner occupy situation, where I live in the home and rent the other 3 rooms on Airbnb as well as Peerspace.

Quote from @Emma Hustis: I am talking to an off market seller of a 120(ish) storage unit facility in Bonner's Ferry, Idaho (near where I live). 

I lived in central Oklahoma the first 20 years of my life.  

Most of the “deals” have no meat left on bone except for maybe a long term rental hold after repairs.They ironically sponsor a lot of the meet ups I’ve been too here in DFW. of course they do they live and breath on newbies..  

I've adjusted my approach now to search for a SFH with the intent of 'live-in flip' for the first year.

Welcome BP compatriots to my weekly "Skeptical Take" on all things real estate, coming at you live from Nashville, TN.