Is that artwork up above - new card art?
If it is Angouleme, I wonder how she fits in. I thought all the new cards that we were getting would be those from Thronebreaker. And she shouldn't appear in Thronebreaker.She didn't join Geralt before the Battle at the Bridge at all and was nothing but a mere bandit before joining.
If I recall correctly, Paweł said that there might be some new cards, so she doesn't necessary have to appear in Thronebreaker.
Meve can somehow stumble upon Nightingale gang, or part of it. Though, I'm not sure how it sits with timeline/geography.
It would be weird in my opinion, if she appeared as part of the Nightingale gang, because she was just a minor part of it. Having her appear there as one of many or even leading a small group feel pretty forced.