The only thing I would mention here is you shouldn't have anything in your lease that a court would consider unreasonable, in case you ever need to go to court.

Curious how this will play out in the courts (granted it's LTR) and affect pricing products used for STR such as PriceLabs (which I use but have to seriously manually adjust for very specific reasons).

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

If a person owns a rental property in IN and if something happens on that property, the cause of action (lawsuit) would go before a court in IN, with an IN judge, citing IN law.

1) Yiu REALLY need to know what CA will  allow you to do, I don’t know, but the state may say too bad landlord, you lose. 2) Assuming your attorney (Or you if you’re able to decode the laws that relate to your situation and are willing to go to court in front of a judge against a “sick” kid.) think you have the right to collect the rent I’d give them two options. 

Give her 30 days notice now, keep her security deposit, and send her a additional bill for damages to the unit in lieu of taking her to court for the damages.  

MA has a lot of courts, not a small state as you know.    

My question is if she doesn't pay in 5 days, could I file a forcible entry detainer at the court ( We are in Macoupin County Illinois)?

The court considers "open and notorious" to be in your favor as opposed to being sneaky and deceptive. 

It can take up to three days to serve, then you can file in court after the 3-day period.