If she is an admin, there is also this option:
View attachment 191348
Other than that check her usergroups she belongs to and her as a user, if her stand-alone options for her user only are set to require it.
If all of that doesn't help (surely it must be in user(group) permissions), then go to your config file and put this into the file, which disables completely two-step verification for all users and you can't un-do it in ACP.
$config['enableTfa'] = false;