Uber normally means "really" or "very much"
For example if I said I was uber strong i would mean I was really strong.
Think the OP is just highlighting the sister is a real strong JW maybe?
"The way of the truth, is the best way of living, no better way can there be found"
Clearly not for many unfortunately they can never do enough and they are blamed for their feelings of inadequacy not the wonderful FDS with its continual, "Do more do more when you have done more do some more after that..."