Debbie B. answered 06/04/19
Professional Editor, Business/Academic Writer, and Author Coach
You can ask her (politely). That is almost besides the point, though. If you agreed not to share her logo and other information in your portfolio, then stick to it. You are getting paid for your work, I hope. Sometimes that is enough.
In the future, if you want the option to disclose/display the design work you did for a client, then don't say yes to such gigs. Good luck!