It is noteworthy that COA is always an estimate.
Regarding informing my school about the aid that I will accept, what should I do if I am offered help through a printed offer?
You might have to sign the offer and mail it back to the school
I understand.  I have another question about the Direct PLUS Loans for Parents.  At what point would a parent on a Direct PLUS loan get the assistance money for their daughter's school?