Yeah, she did lose it for a while, and that ban in China also
hurt her career somewhat.
I agree that Truth is not her best work, but it marked a successful
comeback from a rejuvenated A*Mei. She poured her heart and soul
into the ballads in Truth (no doubt from nursing a broken
heart...sigh) and it really showed.
Every tian hou has her moment of glory, so even though she may have
been surpassed by other tian hou, they in turn will be surpassed by
someone else.... But I'm certain that 20, 30 years from now, my
A*Mei cds will still occupy a place in my collection of all-time
favourites 
Btw, she will be interviewed by Huishi from 93.3fm in the program
Tonight in Person on Channel News Asia. The interview was recorded
today and should be telecast over CNA pretty soon.