Do the enemy method, look at ADR’s and calendars 

Currently i am remodeling my investing propery to hold and rent, I am planing to start with BRRRR method. 

When and how will they communicate?

Instead of a voicemail I sent a text asking for any communication so I can plan accordingly. 

Are there any additional methods I may have overlooked?

In an emergency situation you could always access the HELOC at 8%-13%.This emergency situation should be considered before the funds are accessed with either method, can you afford to have no savings AND be paying 8%-13%.

If you open up the schedule and another guest books, then I agree with @Chris Seveney that a credit (assuming the new booking is at a discounted nightly rate) would be more than generous and also lets her know that you are a reasonable host if she does decide to book again in the future.It just feels odd that she would be contacting you the day of check-in to cancel due to the weather, when she could have communicated this days ago.

This is not to say this is the only successful method of real estate investing, but as I'm sure you're well aware, with current interest rates and overall market conditions, sourcing and acquiring LTR deals is difficult unless you're going off-market. 

That's the simple, proven method that leads to success.

@Alessa LeSarThe BRRRR method is a way to grow a a limited-capital real estate portfolio by buying homes, fixing them up, renting them out, refinancing, and doing it all over again.