Having been through a divorce, I have a pretty good idea what she was asking. She may not have been directly asking if you were willing to testify, but were willing to be listed as a possible witness. It's up to the attorney whether he/she subpoenas you actually appear in court. In any case, I would have said I would rather your attorney contact me and discuss it. She was probably trying to save herself a couple hundred bucks by making the contact directly, because the attorney will bill her for contacting you. (Trust me, they bill for every little piece of scratch paper they use to take notes on!)