Send her a certified letter (keep a copy for yourself) with your concerns of her not turning on the heat and the problems that can occur with frozen pipes and repair cost in which she will be liable for if she doesn't comply.Is she using space heaters instead?

I would say you need to find the contractors first. 

Take the effort to solicit contractor recommendations from multiple people.

Congratulations to your continued success.That said we would like some guidance on crafting a contract where we would partner with contractor to go in on a flip together. 

If you’ve worked with trustworthy contractors or subcontractors in the Jackson County/MO area (especially those familiar with investment properties), I’d love your recommendations.

Thank you  The good GCs charge 20% but this does not equate to your savings because the GC will have better contacts, have namer experience coordinating contractors, be more familiar with permit process and expectations of the inspectors.  

It was a big project in terms of the amount of work it needed, I just ran out of time with my lender going through the garbage with the contractor, finding a new one, and finishing taking the longest. other than that I would've let it sit on the market to get closer to what I actually wanted for the property.

H there, I'm a certified international property specialist and while i don't personally specialize n Costa Rica,  have several colleagues who do.  

And then monthly by check or if you don’t trust them certified funds or EFT. 

I have been told by a contractor that the foundation of the building is intact, so it does not need to be torn down but requires a "gut renovation down to the studs."