These interactions are going to be tough, but you can handle it, as you have.
I know for a fact that my STBXW had similar conversations with her friends, so don't doubt that some of those things your W said have some truth to them.
I'd be cautious of confrontation and discussion about things you find out. Setting boundaries about some things may be fine, but she will be on guard and wary now, and that may not be beneficial to you.
I am not sure I am expressing this correctly in a forum post, or it's coming across to you as I intend. Not a 2x4 or anything like it!
M: 41 STBXW: 41 D: 9 Bomb: 4/26/09
On board the D train now..
"Suffering is when we try to change what we cannot."