Is it possible for my mom to think she is having pain in her eyes that isn't real?

It isn't certain what psychological problems my mom has, as she leads a life of intense denial and absolutely refuses to get any sort of help, but we believe she is a paranoid schizophrenic among other things (depression, anxiety, etc) She also used to be an alcoholic and have a problem abusing prescription drugs. Anyway, during the last few years, my mom seems to be creating new problems to deal with that are increasingly worse. The last big thing I had to deal with from her was that she believes a priest from a church she used to go, was using his (quote), "heightened spiritual abilities," to leave his body at night and stalk my mom, and force her to remember painful memories from her past. Anyway, for the last few months my mom barely leaves her room, and keeps all the lights off, and has furniture and paintings and what not stacked in front of her windows to keep out all light (why not just get curtains? Don't ask me), because she believes she suffered some sort of radiation damage from her cell phone or a doctor gave her a migraine problem from shining a light in her eye or some junk, and now it hurts her eyes to be exposed to light. I don't know what to make of it though, because she apparently really believes her eyes hurt, but five different doctors (two optometrists, two neurologists, and a physician) all don't know what is wrong with her. The optometrists said it must be a problem with her brain because her eyes were fine, but her MRI came back normal. The only thing she won't try, is seeing a psychiatrist. It only makes sense to me that this is all in her head, but I don't know if she can be creating the pain or if there isn't really any pain at all and she's just making it up? It's just very confusing to watch. I mean she has to really believe she is sick or really be depressed from this because she has lost like 40lbs. Sorry if I'm ranting, it's just very frustrating.