Given these circumstances, I believe there may be grounds for a class action lawsuit against these companies, and their owners.

The vast majority of lawsuits against landlords involve wrongful eviction, security deposit disputes, and Fair Housing Violations.

And for sure when your  an LP and your GP goes belly up not much you can do although I am sure lawsuits will be flying from other investors towards the GPs thats a given.

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

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.

IMO Most of the time, people lose lawsuits or settle for much less due to laziness and lack of rock-solid knowledge about the illicit/illegal acts the opposing side committed.  

I've been involved in a lawsuit that settled right at a million dollars, and that was over 20 years ago.

Class action lawsuits might still be a practical solution to the problem, but, if the statute of limitations is not waived, there is no chance of combining the original cases as their time to file has run out.

Otherwise, if something horrible does happen, you just opened up a huge lawsuit that could destroy your life!

If you fail to follow the rules, you may open your personal assets to a lawsuit.