My own feeling from the history you posted is that her arm pain
may be coming from her musculoskeletal system od left hand.
can you let me know what medication she is taking.
Also let me know if she feels pain if one moves her left arm.
Is she diabetic.
Can nurse can check her pulse ,blood pressure and let me know.
Is she mobile and how active she is.
87 doesn't mean to me end of life. I am positive if I have all above information I can be of help