And some of them are structured in ways where they produce passive income. 

LLCs require additional filing fees and tax returns and just complicate things.

Can you generate a report in Buildium to download a CSV file to upload transactions to Stessa via the Stessa CSC uploader?

They take weeks reviewing things and won't call you or tell you when they have reviewed things so you are constantly calling and then waiting for them to find your file.

I would suggest that if the tenant is late on the rent for december then refuse the late payment and file the eviction.

We have 3 rental properties that produce 8k monthly in total on average.

I still tried to reason with her to see if we could repair this, but she hired a personal injury lawyer (who happens to be a cleaning client of her) to start emailing me demanding I give her $125,000 for her 1/2 of the business, or else they are going to file a lawsuit.

Payments where 10k per month, principle filed B/k 3 years ago but still in house.

First you want to be sure a police report on the DV incident and if an order of protection was filed.

Be prepared to start a lawsuit.2) File a complaint with state's Board of Realtors3) File a complaint with state's Attorney General's officeSince these are unlikely to be permanent solutions, you'll also want to start searching for another PMC.Recommend you speak with @Russell Brazil