They made some money, and paid off a CC or took their family on a well-deserved vacation.

Can I legally just put a stop to everything and just tell her that she does not qualify on her own, give her a 30 day notice to vacatate asking for 8 days rent into November?   

Using a turnkey condo for short-term rentals on weekends while reducing your commute could be smart, as long as STR income covers costs and local regulations allow it.From tax perspective, if you personally use the STR as you intend, you cannot create losses under vacation home rules.

Did the tenant(s) ever receive any legal notices (late rent, noise, unauthorized occupants, notice to vacate, etc.)?

Tenant is required to notify Owner in writing of Intention to Vacate or Intention to Re-new at least 60 days before the expiration of this lease.

I have been investing in SFH (single family houses) and using the STR (short term rental or vacation rental) strategy for the past 6ish years or so.

We are in a highly sought after vacation spot that is growing.

Tenant is required to notify Owner in writing of Intention to Vacate or Intention to Re-new at least 60 days before the expiration of this lease.

I am buying all my LTRs with cash that is generated from my other rental income.STR'S for me are high end vacation rentals and I use mortgages for these.

I currently have a Proper policy on my vacation home in the mountains of Western NC, and I am tired of them increasing the rate so much.