As RE developers we all know how important it is to hire good, reliable residential contractors. 

My business partner and I own some STR's here that perform well and are in areas that will definitely appreciate in the near future.

when your in a fund U have an interest in a fund that then has interest in RE and you are once removed from an control.

I’m going to get suedI’m too lazyI always give up on my business ideasEverything I’ve done in the past has failedIt pains me to even write those things now because I’ve learned that they are all so totally untrue.

With hopes to build two additional cabins in the future.

And I hope that is more future readers of this post, and on BP. 

I would notify her in person and in writing (big note on her door) including quoting the clause in the lease where she is responsible, and tell her you will be inspecting to insure the heat remains on, high enough to protect your unit, or she will be breaking the terms of her lease and also liable for any damage done in the downstairs unit as well.

Angel investors might be interested, but you'll likely have to give up a portion of the ownership or future profits, and there could be potential complications in managing the investor's expectations and involvement.

Fees should be clearly stated in writing, easy to understand, and justifiable.

This kind of thing happens and now would be a good time to negotiate and add to your agreement how it will be handled in future.