Holy smokes, Mario. The doctor should know better than to throw the pred dose around like that. It's extremely dangerous to the adrenal glands, which can shut down completely. That's called acute adrenal crisis and is deadly within 24 hours unless something is done.
I'm not sure why her mental abilities suffered with dropping the dose, other than maybe it dropped her blood pressure so much she wasn't getting enough oxygen to her brain. Increasing the pred back up to 60 could easily cause severe weakness, because pred is so damaging to the adrenal glands. Dizziness upon standing means her blood pressure is not adjusting to postural changes. That's a function of the adrenal glands, and the severity of her dizziness indicates a serious problem.
My advice is to get her to a Wegs specialist right away. She also should see an endocrinologist to have her adrenals assessed. While you're waiting for those appointments (tell them that it's urgent for her to be seen), get her to a good PCP to have her blood pressure evaluated.
And BTW, it's usually recommended to take all the pred in the morning, so it doesn't interfere with sleep as much. Check with her doc(s) to make sure that's okay, though.
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