I think the original announcement was pretty ambiguous, I agree with above, if you are seeing shards check if she is not 7* on your roster. If she is not then you have your answer. She is for me (7*) and I am seeing Zetas in the cantina.
In the post it is stated that the duration is 7 days but there is no information about daily refresh of the attempts Does this mean we will have only one free attempt per each battle and one or two additional crystal refreshes?