It would also have to be put up and taken down between each tenant and I don't know how responsive your PM will be to this extra work. 

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). 

I have searched and filled out endless online forms only to have lenders offer me unsecured loans or other products, but not a heloc.  

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?”

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.

Thanks for your response.

We're hoping that there will be more listings coming online here in the next month or so.

Look up the default risk by credit score, this information is readily available online. 

There are mortgage recast calculators online or you can reach out to your lender.P+I payment will go from 2155 to ~1800 given the numbers you provided.