A/C Privilege does cover crimes that have already been committed (if it didn't, no defendant would be able to speak freely with his/her attorney to build a defense) but it does not cover the furtherance of a crime or fraud, nor does it cover the post-commission cover up of a crime. So if this attorney even slightly assisted with any post-commission cover up of any crime, the privilege is waived and she can "flip." (Not saying she did or didn't in this case, but it is technically possible based on the exceptions to A/C Privilege.)
Thanks for the welcome. I am a frequent reader (love catching up on the daily news here) but very infrequent contributor. Trying to work on that second part!