She's not going to have any leg to stand on in court if you get that far unless there's some explicit language prohibiting the owner from assigning responsibilities to another legally authorized party, and I'm guessing there isn't if another PM company was maintaining the lease and provisions - and the fact that the tenant was voluntarily working with the other PM confirms the acceptance of an authorized agent even if it's not explicitly stated, the same way if you accept rent from a tenant after a lease expires you imply acceptance of the lease terms continuing (which is why you should always have a holdover provision). 

The process for commercial properties is basically the same as residential properties, so it takes work.Again, echoing Dominic, a good investment is a good investment, whether you spent 8 months courting an owner to get them to sell to you, or whether it is on CBRE/Cushman/Marcus/Loopnet or any other brokerage website.  

She was also no-show at the court date.However, it turns out that she is defrauding many landlords in the area.

https://natlawreview.com/article/texas-federal-court-issues-nationwide-injunction-against-enforcement-corporate

Why wouldn’t you go to court?

They'll fight tooth & nail in court to keep a full accounting hidden, even to the point of claiming protected work related.

You did purchase the property in one tax year and are selling it in another tax year which satisfies one of the court rulings. 

@Paloma Wodehouse I started by going to Housing Court sessions and hearing the Cases and their "Dispensation of Justice".

File an eviction with the court and provide the proper notices (e.g., 10-day notice to pay or vacate for nonpayment of rent).

We put up a Volleyball court in the back and plan on bringing in sand when the time is right.