MF has seen some significant changes and people recommended precovid may not be recommended now, so be careful.One person I always had a lot of respect for was @Todd Dexheimer who runs a great company and is very knowledgeable (full disclosure not an investor but have met him several times). 

A little bit about me: I'm 30 years old and have been living full time in my sprinter camper van for the past 3 years working remotely in tech.

Your first step is to contact a savvy CPA.You, as a Member of an LLC, by virtue of the LLC records provisions in the LLC law, have as much disclosure access, and more, than a shareholder of a public company.  

Something like: "Know that if you don't pay your full rent by the 01, I will file for eviction".Or should I just wait and if she passes the 01th, file for eviction?

Full time pharmacist trying to gain some sense of financial independence.

Maybe even allow for a small kitchenette for full privacy, although it would be attached to the house with a connecting door.The yard has enough room to allow for it.

Since the ADU needs a full gut, ensure zoning allows its use as a rental.

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

Does it need repairs or a full replacement?

I think public perception of the Midwest has not caught up to the reality on the ground.