If she's month to month give her 30 or 60 days' notice (whatever is required by law). 

I don't know much about real estate law or the inner workings of the business, such as underwriting deals or identfying good deals and locals to invest in.

I would HIGHLY recommend discussing w/ a RE attorney and getting familiar with the tenant/landlord laws in SF. 

.: I'm curious how CA agents can make a living with laws like AB2992 that state:"If the out-of-pocket costs to pay their agent remain too great and the seller and buyer have not yet reached an agreement on the sales price and/or terms, the buyer may walk away from the subject property provided there is an exit clause, proceed without representation, or approach the seller's agent about possible dual agency representation." 

However, you should always do some market research, talk to an attorney, and be knowledgeable about the law in NYC.

They know the market, understand contracts and law, are experts at negotiation, provide a second (objective) set of eyes, and more.

Following the laws has been a "process" to call it nicely.

Quote from @Kar Sun: It appears the law requires you to allow them to attend, inspect together, and mutually agree to a list of damages: https://codes.findlaw.com/tn/title-66-property/tn-code-sect-...Print that off and follow it.Make it clear to her that she is not permitted to bring guests.

That law sounds pretty specific. 

Then I usually get a letter from the Sewer provider citing the Indiana law which says I'm responsible for Sewer if the tenant fails to pay.