How To Treat Pneumonia?

My mother-in-law was discharged from the hospital yesterday. She is fighting pneumonia and had been having diarhea. It is suspected she might have lung cancer, but finding out was judged too risky, as she s 98. She was previously prescribed questran for the diarhea and now avrox for the pneumonia. She is also taking enalapril, hydroxyzine Hcl, vitamins and iron. She recently started taking synthroid. Her doctor is on vacation. Today she has complained of confusion, and is very upset. I thought maybe it was because of the disruption to her routine after being in the hospital for 3 or 4 days. But I m wondering if it s a drug interaction.