Scope of Practice Question

I have worked in a LTC facility as an RN for the last 14 years.  This LTC facility is a big company that owns many other places such as respite care centers and group homes.  I was asked this past Friday by the DON of my facility to give a Humira shot to a patient that lived at the respite care center.  She said the patients mother had forgotten to give it to her prior to dropping her off at respite care.  The DON stated the staff from the respite care center would be bringing the patient to my facility for me to administer the Humira shot.  I told the DON that I don't feel comfortable doing this because I know nothing about the patients medical history etc.  She stated that I was covered and able to do this because we are owned by the same company.   Is she right?