My mother has severe COPD and is on prednisone to help her breath...

My mother has severe COPD and is on prednisone to help her breathe a bit easier. She was on 60 mgs a day for about two weeks and is weaning herself off. She always has the moon face, increased hunger, short temper and high glucose levels with this but this time there is a new side effect. She recently started suffering dillusions. She didn't know she was in her own home, etc. She is currently in the hospital where they are weaning her off of the medication and keeping her sedated. The doctor attributes the dillusions to the prednisone. Has anyone had a similar side effect? I am hoping this is what is causing her dillusions. Thanks for your help.