Ask for 1-3 months of their most recent bank statements.

Would an attorney be necessary or break the bank here making it a waste of money? 

there are 2 liens already on the property - bank and a private lender.What are other recourses1.

The buyer then decided to use a private lender that had also failed to get him the funds to close on time. 

The bank is offering 2 options for modification.

I guess my hang up is that if I’m already using loaned money as a down payment, how will the bank approve another loan on top of the HELOC.  

I do commercial and there are good options but the price ranges are much higher than Single Family and the risk (i.e. in retail, ~80% of the business fail in the 1st year) could be higher. 

Or if you tried it and it failed also let me know.

Their bank can still say we won’t finance it unless this is fixed.

Hold it close to your chest for leverage and if she chooses the eviction route or fails to adhere to the payment plan offer it one time with a shot clock.