Hi Abla,
Is your friend's name Tanya? I checked the Workspace you created and noticed that you have only added her as a member of a board. You remain the Workspace admin and the board admin.
To ensure she has the appropriate access, you need to invite her to join the Workspace. Since this is a Free Workspace, all members are considered admins: https://support.atlassian.com/trello/docs/inviting-people-to-a-workspace/.
To make her a board admin, please follow these instructions: https://support.atlassian.com/trello/docs/making-a-user-an-admin-of-a-board/.
I hope this helps, but let us know if you have any questions!
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