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Deactivated suggests you have deactivated their account, not their access, you'll need to go to administrate users to check what the state of the account is.
Thanks for your reply. I'm not sure how or why this would have happened. I'm the admin on our Trello account and I don't see another way to reactivate her account.
Do I need to remove her and then re-add her to the boards?
That would definitely be worth a try. It will not do any harm.
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