Schedule issues and Edit issues are the correct permissions Lena should request.

Schedule issues gives users the ability to change scheduling related fields and to adjust the placement of issues on boards that use scheduling or ranking for order. That permission is commonly required to move items up and down the sprint backlog so Lena can reorder the list.

Edit issues allows a user to modify issue details and fields that affect backlog order such as the Sprint field or rank. Many board reorder operations change issue data behind the scenes so edit access is also required to make those moves.

Move Issues is oriented toward changing an issue between projects or changing its issue type and it does not grant the ability to reorder backlog items within the same board.

Transition Issues controls moving issues through workflow statuses and it does not affect backlog ranking or the ability to drag items in the sprint backlog.

Browse Projects only allows viewing of the project and its issues and does not permit changing issue order. The scenario states Lena can already open every issue so this permission is not what she is missing.

Manage sprints allows creating, starting, and completing sprints and adjusting sprint metadata but it does not by itself grant the ability to edit issue fields or change an issue's rank on the backlog.

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