landlord property entry

[Piper D.]

As a landlord myself (albeit not of many properties and none of them STR) I am curious what you would all do to handle this situation if you or a loved one were in it:

My sister is a traveling surgical tech on a contract in a very rural area.  She is in a short-term rental, fully furnished, all utilities included (Air BNB type but she is renting directly from the landlord and not via the website).  She has been noticing things were misplaced in the home and set up some security cameras inside because she is single and traveling alone.  There have been at least 4 recorded instances of the landlord entering the home when she is away, and there was one instance where he attempted to let himself in with his keys WHILE she was home (apparently he was surprised to see her show up at the door when she heard the ruckus).  The landlord lives in an apartment next door.  These were not emergency instances, and there was no maintenance being done when he came inside- it appears he's simply "curious".  Nothing has been stolen but she's getting freaked out.  There was no prior notice of intent to enter the premises. The lease does not have any wording about inspections.  

As a landlord, I would never even consider doing this unless there was a legitimate emergency; otherwise I would give proper notice.  I told her to get out ASAP, but with it being such a rural area there are apparently no other available housing options and no hotels.  She is going to see if the hospital will let her out of contract a bit early or if they can assist her with leads on housing (even though she will lose the rent money she has already paid on this place).  

What are potential options in this case? Confront the landlord (it seems he does not realize she has security cameras) and risk him getting angry? Leave him a letter asking him to provide notice of entry? Call authorities when the cameras alert her that he's inside? Small claims court to try to get rent money back after leaving? This particular state requires a minimum of 24hr notice of landlord entry and there is nothing in the lease that would contradict this. I cannot imagine that a STR would be any different than a longer term rental in terms of tenant privacy? Again, it's not like this is a year-long lease she's asking to break because her landlord is violating privacy- her rent has been paid for this short-term assignment and she would simply like her right to "quiet enjoyment" of the property.