“How to manage poor appetite while on Oxycodone?”

My friend had a fractured shoulder surgically repaired on Tuesday. By Thursday she seemed very over medicated on pain meds. She is 64 years old. Today she still seems confused and has difficulty processing things. Also, some issues with ambulation. She has not taken any pain melds since Thursday morning. She was taking oxycodone 10 mg every 12 hours and Percocets for breakthrough pain. How long would the side effects I described normally last? Should my friend get to the emergency room? She also has poor appetite and needs help eating. Needs to be reminded to drink fluids.