Your wife needs decarboxylated edible cannabis ASAP, just build up her tolerance to it VERY slowly. She does not need less THC, she needs MORE and she needs to eat it everyday, throughout the day in small amounts, while trying to steadily/safely increase these amounts over time.
When you mentioned she had an "operation with complications", that said it all! Your wife has a systemic Candida albicans infection in her brain brought on by heavy antibiotics given to her during surgery. Same thing happened to me after spine fusion surgery, thought I was going nuts, it was actually a pathogenic fungus and cannabis oil can kill it, even inside the brain since cannabis safely passes thru the blood/brain barrier. Encephalopathy (brain swelling) resulting from Candida albicans inside the brain indeed can cause voices, trust me.
When cannabinoids kills off the Candida, she will feel ill from the heavy metals, acetaldehyde and other chemicals it drops into the bloodstream. It is important for her to drink plenty of water and I'd recommend eating Bentonite clay and powdered, activated carbon to help rid the body of these toxins. She will urinate frequently for a couple weeks, this is normal at the beginning when taking decarboxylated cannabis medicine internally.
I would also recommend she eats MSM (methylsulfonylmethane) with her edible cannabis, this will help with absorption greatly as it turns to DMSO (dimethylsulfoxide) inside the belly when it meets hydrochloric acid. DMSO then carries the cannabinoids deep inside all tissues of the body, for complete saturation. Plus, the Candida is further defeated by the organic sulfur present in MSM and DMSO.
It will take time, your wife will completely return to normal, but I would recommend that she take a "maintainer dose" of cannabis for the rest of her life because I am convinced that systemic Candida is actually cancer and it is embedded deep inside her, best to be safe and eat maintainer amounts of cannabis for life.
At the end of her heavy cannabis treatment, your wife will be fully back to normal, glowing and beautiful again! Nothing better than decarboxylated cannabis for muscle tone, skin, hair, nails, eyes, gums, teeth, mental and physical health!
She may need to eat a pound or more worth of flowers over the next few months, so guess it is time to turn the littlegrow into a guerilla or something larger but cannabis is 100% the answer to her mental problems. So glad I saw this thread and so glad you included that info about her surgery. You're going to save her with your skills growing cannabis... I've seen it happen personally a few times, in fact it has yet to fail.
P.S. I'd bet she has "floaters" in her vision too, that is common with Candida and Lyme infections once they make it to the head. If so, tell her that cannabis will clear her vision of floaters over time, no need to worry.
Also, tell her to never speak to her doctors of her cannabis treatment, when the cannabis stops the voices, she can be weaned off the big pharma poison that is not working. Doctors against cannabis have a nasty habit of informing your insurance company of cannabis use in violation of the patient/doctor confidentiality clause.
If she cannot afford Rick Simpson type decarboxylated cannabis oil, you can just decarboxylate cannabis nugs inside a rolled-up foil tube with the ends folded over to seal it. Baking the tube in the oven @ 220 degrees for 45 minutes works best for us. Allow to cool before opening the decarboxylated flower tube. Eat these activated buds dipped in an oil like grape seed, olive or coconut for best absorption and more mileage. Tastes fine. After just a few weeks of eating decarboxylated cannabis everyday, her improvement will be undeniable!