How do you politely tell a doctor they don't know what they're doing?

I'm sure all the many years of school and long shifts and sleepless nights has taught you many cool, awesome and wonderful life saving things. But, has it taught you what life is like after the hospital? Do you really, really understand what life is like after the hospital?

My mom has been in and out of hospitals since I was little, and I can tell you that every time she comes back home she's a little different and less herself. How do I tell her doctor that? How do I tell someone who's been doing their profession for god knows how long that they're wrong? I'm only twenty years old, never been to med school, not good at science or math, and have barely lived enough life to tell someone, let alone a doctor, that they're wrong. But I know they are.

They give my mom medicine to go with her illness but don't consider that her illness or her as a person might not go with her medicine. They let you out of the psych ward of the hospital halfway normal and then expect you to be a good patient and continue the regimen you were given for a week, and all of sudden you're on your own. I understand that a doctor is not responsible for the patient after they leave the hospital, but their prescribed medicine should be.

The prescribed medicine the doctors give her is wrong. She acts different when she's given certain medicine, and I can obviously tell she's not herself, but the doctors don't know that. All they know is her illness and how to give medicine for the illness. When my mom is given medicine that doesn't work with her, she doesn't take it because it makes her feel "foggy" or "zombie like" or "less like herself." I tell the doctors that, but they don't listen or they say, "we'll take that into consideration." So, this is a letter to my mom's doctors, saying that I know you're trying to help, but you're wrong. You don't know her. You just know her illness.