Haha, I'm not sure how well your wife will fall for it. Here he is drinking out of a sink (we have well water). I bring him over to it about 2 times a day and the sucker never has dark urates
You said there is no brown part when she defecates? When was the last one that had a brown part? Do you have a substrate in her cage?
I'm still concerned with her sitting down on her arms and not standing up tall on her legs. As Andee said it might be a deficiency starting.
Have you tried watering her with a dripper since she can't see the water? Have you tried slipping an insect between her teeth to see if she will eat it?