[cogs]

...It all sounds like a bit of legalism which those who don't quite yet understand the love of God even for themselves want to impose on another "lesser" person.
...Those who say that this woman was "living in sin" seem to be those who are ready to pick up "the first stone"...
Rom 14:4
4 Who are you to judge someone else's servant? To his own master he stands or falls. And he will stand, for the Lord is able to make him stand.
NIV

these act like the pharisees:
Luk 12:1 In the mean time, when the many thousands of the multitude were gathered together, insomuch that they trod one upon another, he began to say unto his disciples first of all, Beware ye of the leaven of the Pharisees, which is hypocrisy.

perhaps in time this lady will realize the error she's committed, in trying to help the church by keeping sin out of the choir. I really doubt her heart is free of sin. She may not even know the condition of her heart, because she may not be listening to the holy spirit. Wow. I realized that if I start thinking about her, I get pretty angry. So I'll stop focusing on what is obviously the leaven.