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). 

Another option is to co-sign but that has the same impact on my credit and responsibility to the bank.  

Her immediate response was, “What do I get out of this?”

On the other hand, what if you get hit with a slow year and have $0 profit?

The requirement to do this generally involves an experienced GC signing on the borrowing entity as a 20+% owner thus making them a signatory on the loan and responsible for the debt which in most cases is not very easy to find.

However, in some cities, getting work permits is difficult and slow so it can really hurt the investors' timeline through no fault of their own.

Thanks for your response.

@Dominic Mazzarella Not sure what happened to the lengthy response I wrote out - i'll try to re-summarize it here. 

You want an accountant who can help you strategize and who is responsive when you want to know the consequences of the financial decisions you are making throughout the year.Good luck.

Your immediate sarcastic response prompted all this.