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). 

But I usually heard this from people who had never owned a business before, didn’t have the cash to back up their plans, and often were planning to maintain full time jobs.My advice: Start with one business.

If your tenant has a credit score worth maintaining they will not want an uncollected judgment to be on it.  

Additionally you can do a cost segregation study and get a lot of depreciation benefits to offset the rental income (and potentially other income).  

Been studying your market for a while and hoping to Brrrr some properties in 2021.

Have you ever had to maintain a property?

To thrive in real estate investing, you must maintain a firm grip on your finances.

I remember studying your business model early on through your posts and early podcast episodes.

You need to be able to change keys in between tenants to maintain access control and the security of your property.

Would love to connect with people who can give me advice on what to look for or where to study for starting out.